improve log handling

dbflute_fess/freegen/elasticsearch/AbstractBehavior.vm

...ain/java/org/codelibs/fess/app/service/SearchService.java

...n/java/org/codelibs/fess/app/web/search/SearchAction.java

src/main/java/org/codelibs/fess/entity/SearchRenderData.java

...ain/java/org/codelibs/fess/es/bsbhv/AbstractBehavior.java

src/main/java/org/codelibs/fess/helper/SearchLogHelper.java

...va/org/codelibs/fess/helper/impl/SearchLogHelperImpl.java

src/main/resources/fess.xml

src/main/resources/fess_indices/fess_log.json