Check if MGET request failed when we retrieve query rules

Author: ioanatia

x-pack/plugin/ent-search/src/main/java/org/elasticsearch/xpack/application/rules/RuleQueryBuilder.java

@@ -252,6 +252,11 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) {
 
                     for (MultiGetItemResponse item : multiGetResponse) {
                         String rulesetId = item.getId();
+                        if (item.isFailed()) {
+                            listener.onFailure(item.getFailure().getFailure());
+                            return;
+                        }
+
                         GetResponse getResponse = item.getResponse();
 
                         if (getResponse.isExists() == false) {