fix Inconsistent synchronization

src/main/java/org/codelibs/fess/es/config/exentity/ElevateWord.java

@@ -37,7 +37,7 @@ public class ElevateWord extends BsElevateWord {
 
     private String[] labelTypeIds;
 
-    private List<LabelType> labelTypeList;
+    private volatile List<LabelType> labelTypeList;
 
     /* (non-Javadoc)
      * @see org.codelibs.fess.db.exentity.CrawlingConfig#getLabelTypeIds()

src/main/java/org/codelibs/fess/es/config/exentity/LabelType.java

@@ -36,7 +36,7 @@ public class LabelType extends BsLabelType {
     private static final long serialVersionUID = 1L;
     private String[] roleTypeIds;
 
-    private List<RoleType> roleTypeList;
+    private volatile List<RoleType> roleTypeList;
 
     public String[] getRoleTypeIds() {
         if (roleTypeIds == null) {