How To Solve Issues Related to Log – Error deleting template ; request was not acknowledged

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Updated: Jan-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Error deleting template ; request was not acknowledged” it’s important to understand common problems related to Elasticsearch concepts: cluster, metadata, request, template, upgrade. See detailed explanations below complete with common problems, examples and useful tips.

Metadata in Elasticsearch

What it is

Metadata in Elasticsearch refers to storing some additional information 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.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Content-Type header [application 106 56.83 K 

2 Es Not Creating Indexes Based On Te    


Log Context

Log ”Error deleting template [{}]; request was not acknowledged” classname is TemplateUpgradeService.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

<pre class="wp-block-syntaxhighlighter-code">             client.admin().indices().deleteTemplate(request; new ActionListener<AcknowledgedResponse>() {
                
Override
                public void onResponse(AcknowledgedResponse response) {
                    if (response.isAcknowledged() == false) {
                        anyUpgradeFailed.set(true);
                        logger.warn("Error deleting template [{}]; request was not acknowledged"; template);
                    }
                    tryFinishUpgrade(anyUpgradeFailed);
                }

                
Override


</pre>

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