diff --git a/src/main/java/org/codelibs/fess/es/client/FessEsClient.java b/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
index 64c86bed66b96695f744c86d8976105bcb162f30..6eefb360d16f502ca712f6c7418e1a5f4c2904ce 100644
--- a/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
+++ b/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
@@ -653,31 +653,45 @@ public class FessEsClient implements Client {
 
         int count = 0;
         String scrollId = response.getScrollId();
-        while (scrollId != null) {
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                scrollId = null;
-                break;
-            }
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
+                }
 
-            final BulkRequestBuilder bulkRequest = client.prepareBulk();
-            for (final SearchHit hit : hits) {
-                bulkRequest.add(client.prepareDelete().setIndex(index).setId(hit.getId()));
-                count++;
-            }
-            final BulkResponse bulkResponse = bulkRequest.execute().actionGet(fessConfig.getIndexBulkTimeout());
-            if (bulkResponse.hasFailures()) {
-                throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
-            }
+                final BulkRequestBuilder bulkRequest = client.prepareBulk();
+                for (final SearchHit hit : hits) {
+                    bulkRequest.add(client.prepareDelete().setIndex(index).setId(hit.getId()));
+                    count++;
+                }
+                final BulkResponse bulkResponse = bulkRequest.execute().actionGet(fessConfig.getIndexBulkTimeout());
+                if (bulkResponse.hasFailures()) {
+                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
+                }
 
-            response =
-                    client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(fessConfig.getIndexBulkTimeout());
-            scrollId = response.getScrollId();
+                response =
+                        client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute()
+                                .actionGet(fessConfig.getIndexBulkTimeout());
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
+                }
+                scrollId = response.getScrollId();
+            }
+        } finally {
+            deleteScrollContext(scrollId);
         }
         return count;
     }
 
+    protected void deleteScrollContext(final String scrollId) {
+        if (scrollId != null) {
+            client.prepareClearScroll().addScrollId(scrollId)
+                    .execute(ActionListener.wrap(res -> {}, e -> logger.warn("Failed to clear the scroll context.", e)));
+        }
+    }
+
     protected <T> T get(final String index, final String type, final String id, final SearchCondition<GetRequestBuilder> condition,
             final SearchResult<T, GetRequestBuilder, GetResponse> searchResult) {
         final long startTime = System.currentTimeMillis();
diff --git a/src/main/java/org/codelibs/fess/es/config/allcommon/EsAbstractBehavior.java b/src/main/java/org/codelibs/fess/es/config/allcommon/EsAbstractBehavior.java
index 6fd8e8bd10a7b90c5005f6c934037c800b9ecd89..71f0fb13d06848a220539662d408b16fa320eb08 100644
--- a/src/main/java/org/codelibs/fess/es/config/allcommon/EsAbstractBehavior.java
+++ b/src/main/java/org/codelibs/fess/es/config/allcommon/EsAbstractBehavior.java
@@ -227,32 +227,40 @@ public abstract class EsAbstractBehavior<ENTITY extends Entity, CB extends Condi
     }
 
     protected void delegateBulkRequest(final ConditionBean cb, Function<SearchHits, Boolean> handler) {
-        SearchResponse response = null;
-        while (true) {
-            if (response == null) {
-                final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForCursor).setSize(sizeForCursor);
-                final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
-                if (esCb.getPreference() != null) {
-                    builder.setPreference(esCb.getPreference());
+        final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForCursor).setSize(sizeForCursor);
+        final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
+        if (esCb.getPreference() != null) {
+            builder.setPreference(esCb.getPreference());
+        }
+        esCb.request().build(builder);
+        SearchResponse response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
+        String scrollId = response.getScrollId();
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
+                }
+
+                if (!handler.apply(searchHits)) {
+                    break;
                 }
-                esCb.request().build(builder);
-                response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
-            } else {
-                final String scrollId = response.getScrollId();
-                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
-            }
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                break;
-            }
 
-            if (!handler.apply(searchHits)) {
-                if (response.getScrollId() != null) {
-                    client.prepareClearScroll().addScrollId(response.getScrollId()).execute(ActionListener.wrap(() -> {}));
+                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
                 }
-                break;
+                scrollId = response.getScrollId();
             }
+        } finally {
+            deleteScrollContext(scrollId);
+        }
+    }
+
+    protected void deleteScrollContext(final String scrollId) {
+        if (scrollId != null) {
+            client.prepareClearScroll().addScrollId(scrollId).execute(ActionListener.wrap(() -> {}));
         }
     }
 
@@ -356,39 +364,40 @@ public abstract class EsAbstractBehavior<ENTITY extends Entity, CB extends Condi
 
     @Override
     protected int delegateQueryDelete(final ConditionBean cb, final DeleteOption<? extends ConditionBean> option) {
-        SearchResponse response = null;
+        final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForDelete).setSize(sizeForDelete);
+        final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
+        if (esCb.getPreference() != null) {
+            esCb.setPreference(esCb.getPreference());
+        }
+        esCb.request().build(builder);
+        SearchResponse response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
+        String scrollId = response.getScrollId();
         int count = 0;
-        while (true) {
-            if (response == null) {
-                final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForDelete).setSize(sizeForDelete);
-                final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
-                if (esCb.getPreference() != null) {
-                    esCb.setPreference(esCb.getPreference());
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
                 }
-                esCb.request().build(builder);
-                response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
-            } else {
-                final String scrollId = response.getScrollId();
-                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
-            }
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                break;
-            }
 
-            final BulkRequestBuilder bulkRequest = client.prepareBulk();
-            for (final SearchHit hit : hits) {
-                bulkRequest.add(client.prepareDelete().setIndex(asEsIndex()).setId(hit.getId()));
-            }
-            count += hits.length;
-            final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
-            if (bulkResponse.hasFailures()) {
-                if (response.getScrollId() != null) {
-                    client.prepareClearScroll().addScrollId(response.getScrollId()).execute(ActionListener.wrap(() -> {}));
+                final BulkRequestBuilder bulkRequest = client.prepareBulk();
+                for (final SearchHit hit : hits) {
+                    bulkRequest.add(client.prepareDelete().setIndex(asEsIndex()).setId(hit.getId()));
+                }
+                count += hits.length;
+                final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
+                if (bulkResponse.hasFailures()) {
+                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
+                }
+
+                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
                 }
-                throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
             }
+        } finally {
+            deleteScrollContext(scrollId);
         }
         return count;
     }
diff --git a/src/main/java/org/codelibs/fess/es/log/allcommon/EsAbstractBehavior.java b/src/main/java/org/codelibs/fess/es/log/allcommon/EsAbstractBehavior.java
index f63ec1aa1a71fd5f7de62eb43bd5b9494ccbbdcf..16dd78fcf15330f7413a0d6fb2e0e7cdf7144ea0 100644
--- a/src/main/java/org/codelibs/fess/es/log/allcommon/EsAbstractBehavior.java
+++ b/src/main/java/org/codelibs/fess/es/log/allcommon/EsAbstractBehavior.java
@@ -227,32 +227,40 @@ public abstract class EsAbstractBehavior<ENTITY extends Entity, CB extends Condi
     }
 
     protected void delegateBulkRequest(final ConditionBean cb, Function<SearchHits, Boolean> handler) {
-        SearchResponse response = null;
-        while (true) {
-            if (response == null) {
-                final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForCursor).setSize(sizeForCursor);
-                final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
-                if (esCb.getPreference() != null) {
-                    builder.setPreference(esCb.getPreference());
+        final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForCursor).setSize(sizeForCursor);
+        final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
+        if (esCb.getPreference() != null) {
+            builder.setPreference(esCb.getPreference());
+        }
+        esCb.request().build(builder);
+        SearchResponse response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
+        String scrollId = response.getScrollId();
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
+                }
+
+                if (!handler.apply(searchHits)) {
+                    break;
                 }
-                esCb.request().build(builder);
-                response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
-            } else {
-                final String scrollId = response.getScrollId();
-                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
-            }
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                break;
-            }
 
-            if (!handler.apply(searchHits)) {
-                if (response.getScrollId() != null) {
-                    client.prepareClearScroll().addScrollId(response.getScrollId()).execute(ActionListener.wrap(() -> {}));
+                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
                 }
-                break;
+                scrollId = response.getScrollId();
             }
+        } finally {
+            deleteScrollContext(scrollId);
+        }
+    }
+
+    protected void deleteScrollContext(final String scrollId) {
+        if (scrollId != null) {
+            client.prepareClearScroll().addScrollId(scrollId).execute(ActionListener.wrap(() -> {}));
         }
     }
 
@@ -356,39 +364,40 @@ public abstract class EsAbstractBehavior<ENTITY extends Entity, CB extends Condi
 
     @Override
     protected int delegateQueryDelete(final ConditionBean cb, final DeleteOption<? extends ConditionBean> option) {
-        SearchResponse response = null;
+        final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForDelete).setSize(sizeForDelete);
+        final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
+        if (esCb.getPreference() != null) {
+            esCb.setPreference(esCb.getPreference());
+        }
+        esCb.request().build(builder);
+        SearchResponse response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
+        String scrollId = response.getScrollId();
         int count = 0;
-        while (true) {
-            if (response == null) {
-                final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForDelete).setSize(sizeForDelete);
-                final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
-                if (esCb.getPreference() != null) {
-                    esCb.setPreference(esCb.getPreference());
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
                 }
-                esCb.request().build(builder);
-                response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
-            } else {
-                final String scrollId = response.getScrollId();
-                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
-            }
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                break;
-            }
 
-            final BulkRequestBuilder bulkRequest = client.prepareBulk();
-            for (final SearchHit hit : hits) {
-                bulkRequest.add(client.prepareDelete().setIndex(asEsIndex()).setId(hit.getId()));
-            }
-            count += hits.length;
-            final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
-            if (bulkResponse.hasFailures()) {
-                if (response.getScrollId() != null) {
-                    client.prepareClearScroll().addScrollId(response.getScrollId()).execute(ActionListener.wrap(() -> {}));
+                final BulkRequestBuilder bulkRequest = client.prepareBulk();
+                for (final SearchHit hit : hits) {
+                    bulkRequest.add(client.prepareDelete().setIndex(asEsIndex()).setId(hit.getId()));
+                }
+                count += hits.length;
+                final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
+                if (bulkResponse.hasFailures()) {
+                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
+                }
+
+                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
                 }
-                throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
             }
+        } finally {
+            deleteScrollContext(scrollId);
         }
         return count;
     }
diff --git a/src/main/java/org/codelibs/fess/es/user/allcommon/EsAbstractBehavior.java b/src/main/java/org/codelibs/fess/es/user/allcommon/EsAbstractBehavior.java
index 3dbf64e139a3d6b59e4aa1d99cb6f1f2230435db..13027c638a314aea31da472530dca1a32c2994a2 100644
--- a/src/main/java/org/codelibs/fess/es/user/allcommon/EsAbstractBehavior.java
+++ b/src/main/java/org/codelibs/fess/es/user/allcommon/EsAbstractBehavior.java
@@ -227,32 +227,40 @@ public abstract class EsAbstractBehavior<ENTITY extends Entity, CB extends Condi
     }
 
     protected void delegateBulkRequest(final ConditionBean cb, Function<SearchHits, Boolean> handler) {
-        SearchResponse response = null;
-        while (true) {
-            if (response == null) {
-                final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForCursor).setSize(sizeForCursor);
-                final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
-                if (esCb.getPreference() != null) {
-                    builder.setPreference(esCb.getPreference());
+        final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForCursor).setSize(sizeForCursor);
+        final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
+        if (esCb.getPreference() != null) {
+            builder.setPreference(esCb.getPreference());
+        }
+        esCb.request().build(builder);
+        SearchResponse response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
+        String scrollId = response.getScrollId();
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
+                }
+
+                if (!handler.apply(searchHits)) {
+                    break;
                 }
-                esCb.request().build(builder);
-                response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
-            } else {
-                final String scrollId = response.getScrollId();
-                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
-            }
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                break;
-            }
 
-            if (!handler.apply(searchHits)) {
-                if (response.getScrollId() != null) {
-                    client.prepareClearScroll().addScrollId(response.getScrollId()).execute(ActionListener.wrap(() -> {}));
+                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
                 }
-                break;
+                scrollId = response.getScrollId();
             }
+        } finally {
+            deleteScrollContext(scrollId);
+        }
+    }
+
+    protected void deleteScrollContext(final String scrollId) {
+        if (scrollId != null) {
+            client.prepareClearScroll().addScrollId(scrollId).execute(ActionListener.wrap(() -> {}));
         }
     }
 
@@ -356,39 +364,40 @@ public abstract class EsAbstractBehavior<ENTITY extends Entity, CB extends Condi
 
     @Override
     protected int delegateQueryDelete(final ConditionBean cb, final DeleteOption<? extends ConditionBean> option) {
-        SearchResponse response = null;
+        final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForDelete).setSize(sizeForDelete);
+        final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
+        if (esCb.getPreference() != null) {
+            esCb.setPreference(esCb.getPreference());
+        }
+        esCb.request().build(builder);
+        SearchResponse response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
+        String scrollId = response.getScrollId();
         int count = 0;
-        while (true) {
-            if (response == null) {
-                final SearchRequestBuilder builder = client.prepareSearch(asEsIndex()).setScroll(scrollForDelete).setSize(sizeForDelete);
-                final EsAbstractConditionBean esCb = (EsAbstractConditionBean) cb;
-                if (esCb.getPreference() != null) {
-                    esCb.setPreference(esCb.getPreference());
+        try {
+            while (scrollId != null) {
+                final SearchHits searchHits = response.getHits();
+                final SearchHit[] hits = searchHits.getHits();
+                if (hits.length == 0) {
+                    break;
                 }
-                esCb.request().build(builder);
-                response = esCb.build(builder).execute().actionGet(scrollSearchTimeout);
-            } else {
-                final String scrollId = response.getScrollId();
-                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
-            }
-            final SearchHits searchHits = response.getHits();
-            final SearchHit[] hits = searchHits.getHits();
-            if (hits.length == 0) {
-                break;
-            }
 
-            final BulkRequestBuilder bulkRequest = client.prepareBulk();
-            for (final SearchHit hit : hits) {
-                bulkRequest.add(client.prepareDelete().setIndex(asEsIndex()).setId(hit.getId()));
-            }
-            count += hits.length;
-            final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
-            if (bulkResponse.hasFailures()) {
-                if (response.getScrollId() != null) {
-                    client.prepareClearScroll().addScrollId(response.getScrollId()).execute(ActionListener.wrap(() -> {}));
+                final BulkRequestBuilder bulkRequest = client.prepareBulk();
+                for (final SearchHit hit : hits) {
+                    bulkRequest.add(client.prepareDelete().setIndex(asEsIndex()).setId(hit.getId()));
+                }
+                count += hits.length;
+                final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
+                if (bulkResponse.hasFailures()) {
+                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
+                }
+
+                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);
+                if (!scrollId.equals(response.getScrollId())) {
+                    deleteScrollContext(scrollId);
                 }
-                throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
             }
+        } finally {
+            deleteScrollContext(scrollId);
         }
         return count;
     }