Unexpected null response from test query – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Unexpected null response from test query ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response, query and plugin.

Log Context

Log “Unexpected null response from test query”classname  is Pivot.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

SearchRequest searchRequest = buildSearchRequest(sourceConfig; null; TEST_QUERY_PAGE_SIZE); 
 client.execute(SearchAction.INSTANCE; searchRequest; ActionListener.wrap(response -> {
 if (response == null) {
 new ElasticsearchStatusException("Unexpected null response from test query"; RestStatus.SERVICE_UNAVAILABLE)
 if (response.status() != RestStatus.OK) {


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