Failed to build inner_hits – 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 ” failed to build inner_hits ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: 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 “failed to build inner_hits”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (innerHitBuilders.size() > 0) {
 for (Map.Entry entry : innerHitBuilders.entrySet()) {
 try {
 entry.getValue().build(context; context.innerHits());
 } catch (IOException e) {
 throw new SearchException(shardTarget; "failed to build inner_hits"; e);
 if (source.sorts() != null) {
 try {


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