Briefly, this error occurs when Elasticsearch fails to install token metadata due to issues like insufficient permissions, corrupted metadata, or disk space issues. To resolve this, you can try the following: 1) Check and adjust the permissions of the Elasticsearch directories. 2) Clear any corrupted metadata files. 3) Ensure there is enough disk space available for Elasticsearch to operate. 4) Restart the Elasticsearch service. Always remember to backup your data before making any changes.
This guide will help you check for common problems that cause the log ” unable to install token metadata ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, 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 “unable to install token metadata” classname is TokenService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
}
@Override
public void onFailure(Exception e) {
installTokenMetadataInProgress.set(false);
logger.error("unable to install token metadata"; e);
}
@Override
public void clusterStateProcessed(ClusterState oldState; ClusterState newState) {
installTokenMetadataInProgress.set(false);
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