Failed to fetch field caps for – How to solve this Elasticsearch error

Opster Team

March-22, 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.

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This guide will help you check for common problems that cause the log ” Failed to fetch field caps for ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .


Log Context

Log “Failed to fetch field caps for”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

ElasticsearchException e = new ElasticsearchException(
 "Failed to fetch field caps for " + Arrays.toString(response.getFailedIndices())
 for (FieldCapabilitiesFailure f : response.getFailures()) {
 new ElasticsearchException("Failed to fetch field caps for " + Arrays.toString(f.getIndices()); f.getException())
 throw e;
 List dimensionFieldNames = new ArrayList<>();


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