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.
Take a self-guided product tour to see for yourself (no registration required).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 TimeSeriesMetricsService.java 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()) {
e.addSuppressed(
new ElasticsearchException("Failed to fetch field caps for " + Arrays.toString(f.getIndices()); f.getException())
);
}
throw e;
}
List dimensionFieldNames = new ArrayList<>();
