Briefly, this error occurs when Elasticsearch tries to find an index template that matches the specified name, but it doesn’t exist. This could be due to a typo in the template name or the template was not created. To resolve this issue, you can either create a new index template with the specified name or correct the name if it was misspelled. Also, ensure that the template is created in the correct cluster if you’re working with multiple Elasticsearch clusters.
This guide will help you check for common problems that cause the log ” index template matching [” + request.name() + “] not found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: template, admin, indices, request, index.
If you want to learn more about Elasticsearch templates, check out this guide.
Overview
A template in Elasticsearch falls into one of the two following categories and is indexed inside Elasticsearch using its dedicated endpoint:
- Index templates, which are a way to define a set of rules including index settings, mappings and an index pattern. The template is applied automatically whenever a new index is created with the matching pattern. Templates are also used to dynamically apply custom mapping for the fields which are not predefined inside existing mapping.
- Search templates, which help in defining templates for search queries using mustache scripting language. These templates act as a placeholder for variables defined inside the search queries.
Examples
Create a dynamic index template
PUT /_template/template_1?pretty
{
"index_patterns": [
"logs*",
"api*"
],
"settings": {
"number_of_shards": 2
},
"mappings": {
"dynamic_templates": [
{
"strings": {
"match_mapping_type": "string",
"mapping": {
"type": "keyword"
}
}
}
],
"properties": {
"host_name": {
"type": "keyword"
},
"created_at": {
"type": "date"
}
}
}
}Create a search template
POST /_scripts/search_template_1?pretty
{
"script": {
"lang": "mustache",
"source": {
"query": {
"match": {
"description": "{{query_string}}"
}
}
}
}
}Executing a search query using search template
GET /_search/template?pretty
{
"id": "search_template_1",
"params": {
"query_string": "hello world"
}
}The search request will be executed by default on all the indices available in the cluster and can be limited to particular indices using an index parameter.
Notes
- A dynamic index template is always useful when you do not know the field names in advance and want to control their mapping as per the business use case.
Log Context
Log “index template matching [” + request.name() + “] not found” class name is TransportGetComposableIndexTemplateAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
}
}
} else if (allTemplates.containsKey(name)) {
results.put(name; allTemplates.get(name));
} else {
throw new ResourceNotFoundException("index template matching [" + request.name() + "] not found");
}
}
if (request.includeDefaults() && DataLifecycle.isEnabled()) {
listener.onResponse(
new GetComposableIndexTemplateAction.Response(
[ratemypost]
