增加search_analyzer为空的处理

@@ -600,6 +600,10 @@ public class SearchExplainerService {
         fieldDesc.analyzer = (String) fieldPropMap.get("analyzer");
         fieldDesc.search_analyzer = (String) fieldPropMap.get("search_analyzer");
 
+        if(fieldDesc.search_analyzer == null && fieldDesc.analyzer != null){
+            fieldDesc.search_analyzer = fieldDesc.analyzer;
+        }
+
         Object copyTo = fieldPropMap.get("copy_to");
         if (copyTo != null && copyTo instanceof List) {
             List<String> copyToFields = (List<String>) copyTo;