diff --git a/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedContentBhv.java b/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedContentBhv.java
index e4c5ccf97..25bd0e19c 100644
--- a/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedContentBhv.java
+++ b/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedContentBhv.java
@@ -16,10 +16,14 @@
 package org.codelibs.fess.es.config.exbhv;
 
 import org.codelibs.fess.es.config.bsbhv.BsRelatedContentBhv;
+import org.codelibs.fess.util.ComponentUtil;
 
 /**
  * @author FreeGen
  */
 public class RelatedContentBhv extends BsRelatedContentBhv {
-
+    @Override
+    protected String asEsIndex() {
+        return ComponentUtil.getFessConfig().getIndexConfigIndex();
+    }
 }
diff --git a/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedQueryBhv.java b/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedQueryBhv.java
index f367686d7..7d0de6c29 100644
--- a/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedQueryBhv.java
+++ b/src/main/java/org/codelibs/fess/es/config/exbhv/RelatedQueryBhv.java
@@ -16,10 +16,14 @@
 package org.codelibs.fess.es.config.exbhv;
 
 import org.codelibs.fess.es.config.bsbhv.BsRelatedQueryBhv;
+import org.codelibs.fess.util.ComponentUtil;
 
 /**
  * @author FreeGen
  */
 public class RelatedQueryBhv extends BsRelatedQueryBhv {
-
+    @Override
+    protected String asEsIndex() {
+        return ComponentUtil.getFessConfig().getIndexConfigIndex();
+    }
 }