Briefly, this error occurs when Elasticsearch encounters issues while updating the health metadata, which could be due to insufficient disk space, network connectivity issues, or corrupted indices. To resolve this, you can try freeing up disk space, checking network connectivity, or repairing the corrupted indices. If the issue persists, consider restarting the Elasticsearch service or, in extreme cases, reindexing the data.
This guide will help you check for common problems that cause the log ” failure during health metadata update ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: metadata.
Overview
Metadata in Elasticsearch refers to additional information stored for each document. This is achieved using the specific metadata fields available in Elasticsearch. The default behavior of some of these metadata fields can be customized during mapping creation.
Examples
Using _meta meta-field for storing application-specific information with the mapping:
PUT /my_index?pretty
{
"mappings": {
"_meta": {
"domain": "security",
"release_information": {
"date": "18-01-2020",
"version": "7.5"
}
}
}
}Notes
- In version 2.x, Elasticsearch had a total 13 meta fields available, which are: _index, _uid, _type, _id, _source, _size, _all, _field_names, _timestamp, _ttl, _parent, _routing, _meta
- In version 5.x, _timestamp and _ttl meta fields were removed.
- In version 6.x, the _parent meta field was removed.
- In version 7.x, _uid and _all meta fields were removed.
Log Context
Log “failure during health metadata update” classname is HealthMetadataService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
*/
abstract static class UpsertHealthMetadataTask implements ClusterStateTaskListener {
@Override
public void onFailure(@Nullable Exception e) {
logger.error("failure during health metadata update"; e);
}
abstract ClusterState execute(ClusterState currentState);
static class Executor implements ClusterStateTaskExecutor {
