搜索时支持从conversion搜索提取推荐词

@@ -247,11 +247,27 @@ public class SuggestServiceImpl implements ISuggestService, ApplicationEventPubl
                 return null;
             }
 
-            // 5) 将suggest分为两类：一类是从query分词出来的单个term 一类是从suggest获取的优先级较高的keyword
-            List<String> resultTerms = new ArrayList<>();
-            searchResult.getResultList().forEach(map -> {
-                resultTerms.add((String) map.get("keyword"));
-            });
+            final List<String> resultTerms = new ArrayList<>();
+            if (CollectionUtils.isNotEmpty(searchResult.getResultList())) {
+                // 5.1) 从suggest获取的keyword列表
+                searchResult.getResultList().forEach(map -> {
+                    resultTerms.add((String) map.get("keyword"));
+                });
+            } else {
+                // 5.2) 从conversion获取keyword列表
+                String dest = getTermsBySuggestConversion(queryWord);
+                if (StringUtils.isNotEmpty(dest)) {
+                    int count = 0;
+                    for (String keyword : dest.split(",")) {
+                        count++;
+                        resultTerms.add(keyword);
+                        // 最多返回五个推荐词
+                        if (count == 5) {
+                            break;
+                        }
+                    }
+                }
+            }
 
             // 6) 加入缓存
             suggestResult = new JSONObject();
@@ -265,6 +281,45 @@ public class SuggestServiceImpl implements ISuggestService, ApplicationEventPubl
         }
     }
 
+    private String getTermsBySuggestConversion(String queryWord) {
+        long begin = System.currentTimeMillis();
+        logger.info("[func=getTermsBySuggestConversion][query={}][begin={}]", queryWord, begin);
+
+        // 2) 根据terms搜索构造搜索请求
+        SearchParam searchParam = new SearchParam();
+        MatchQueryBuilder queryBuilder = QueryBuilders.matchQuery("source", queryWord);
+        searchParam.setQuery(queryBuilder);
+        searchParam.setPage(1);
+        searchParam.setSize(1);
+
+        // 3) 先从缓存中获取
+        final String indexName = ISearchConstants.INDEX_NAME_CONVERSION;
+        JSONObject suggestResult = searchCacheService.getJSONObjectFromCache(indexName, searchParam);
+        if (suggestResult != null) {
+            CACHE_MATCH_REQUEST.info("match cache for product list terms conversion, keyword = {}.", queryWord);
+            return suggestResult.getString("dest");
+        }
+
+        // 4) 调用ES执行搜索
+        SearchResult searchResult = searchCommonService.doSearch(indexName, searchParam);
+        if (searchResult == null) {
+            return null;
+        }
+
+        String dest = "";
+        if (CollectionUtils.isNotEmpty(searchResult.getResultList())) {
+            // 5) 从conversion获取的keyword列表
+            dest = (String) searchResult.getResultList().get(0).get("dest");
+        }
+
+        // 6) 加入缓存
+        suggestResult = new JSONObject();
+        suggestResult.put("dest", dest);
+        searchCacheService.addJSONObjectToCache(indexName, searchParam, suggestResult);
+        logger.info("[func=getTermsBySuggestConversion][query={}][cost={}]", queryWord, System.currentTimeMillis() - begin);
+        return dest;
+    }
+
     private SearchParam buildSearchParamForTerms(Map<String, String> paramMap) {
         final String countField = getCountField(paramMap);
         SearchParam searchParam = new SearchParam();