Miss the node type condition in the es searchServices query. (#4821)

oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/query/MetadataQueryEsDAO.java

@@ -117,6 +117,7 @@ public class MetadataQueryEsDAO extends EsDAO implements IMetadataQueryDAO {
 
         BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
 
+        boolQueryBuilder.must().add(QueryBuilders.termQuery(ServiceTraffic.NODE_TYPE, NodeType.Normal.value()));
         if (!Strings.isNullOrEmpty(keyword)) {
             String matchCName = MatchCNameBuilder.INSTANCE.build(ServiceTraffic.NAME);
             boolQueryBuilder.must().add(QueryBuilders.matchQuery(matchCName, keyword));