增加一个展示SKN分词结果的接口，增加清理缓存对象的restful接口

@@ -48,6 +48,21 @@ public class SearchExplainerController {
         }
     }
 
+    @RequestMapping(value = "/tools/clearExplainCachedData")
+    @ResponseBody
+    public Map<String, Object> clearExplainCachedData(HttpServletRequest request) {
+        try {
+            searchExplainerService.clearCachedData();
+            Map<String, Object> map = new HashMap<>();
+            map.put("code", "200");
+            map.put("message", "succeed");
+            return map;
+        } catch (Throwable t) {
+            logger.error(t.getMessage(), t);
+            return errorResult(t.getMessage());
+        }
+    }
+
     @RequestMapping(value = "/tools/tokens")
     @ResponseBody
     public Map<String, Object> getTokens(@RequestParam String skn) {

@@ -107,6 +107,13 @@ public class SearchExplainerService {
         return esField.getFieldName();
     }
 
+    public void clearCachedData(){
+        this.localMutilFields = null;
+        this.localMutilFieldWithBoostList = null;
+        this.localCopiedFieldMap = null;
+        this.localFieldDescMap = null;
+    }
+
     public Map<String, Object> show(Map<String, String> paramMap) throws Exception {
         Map<String, Object> map = new LinkedHashMap<>();
         String skn = paramMap.get("skn");