Briefly, this error occurs when Elasticsearch is unable to retrieve field capabilities for a specific field or fields. This could be due to a variety of reasons such as incorrect field name, lack of permissions, or issues with the underlying data. To resolve this issue, you can verify the field name, ensure the user has the necessary permissions, or check the integrity of the underlying data. If the problem persists, consider reindexing the data or checking the Elasticsearch logs for more detailed error information.
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” class name 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<>();
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