; Shard failures – 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 Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” ; Shard failures ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard and search.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “; Shard failures”classname  is AbstractSearchAsyncAction.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public void sendSearchResponse(InternalSearchResponse internalSearchResponse; String scrollId) {
 ShardSearchFailure[] failures = buildShardFailures();
 Boolean allowPartialResults = request.allowPartialSearchResults();
 assert allowPartialResults != null : "SearchRequest missing setting for allowPartialSearchResults";
 if (allowPartialResults == false && failures.length > 0){
 raisePhaseFailure(new SearchPhaseExecutionException(""; "Shard failures"; null; failures));
 } else {
 listener.onResponse(buildSearchResponse(internalSearchResponse; scrollId; failures));


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