2020-04-28 18:10:50 -04:00
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[[indices-templates]]
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=== Index template API
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++++
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<titleabbrev>Index template</titleabbrev>
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++++
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This documentation is about V2 (version 2) index templates. For V1 templates please see the
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<<indices-templates-v1,V1 template documentation>>.
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[NOTE]
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====
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2020-05-11 16:56:42 -04:00
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In {es} 7.8 V2 templates were introduced. When a V2 index template matches a given index it always
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takes precedence over a V1 template. If no V2 index template matches, a V1 template may still match
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and be applied.
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2020-04-28 18:10:50 -04:00
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====
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An index template is a way to tell {es} how to configure an index when it is created. Templates are
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configured prior to index creation and then when an index is created either manually or through
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indexing a document, the template settings are used as a basis for creating the index.
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There are two types of templates, index templates and <<indices-component-template,component
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templates>>. Component templates are reusable building blocks that configure mappings, settings, and
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aliases. You use component templates to construct index templates, they aren't directly applied to a
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set of indices. Index templates can contain a collection of component templates, as well as directly
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specify settings, mappings, and aliases.
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If a new index matches more than one index template, the index template with the highest priority is used.
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If an index is created with explicit settings and also matches an index template,
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the settings from the create index request take precedence over settings specified in the index template and its component templates.
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[source,console]
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--------------------------------------------------
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PUT _index_template/template_1
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{
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"index_patterns": ["te*", "bar*"],
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"template": {
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"settings": {
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"number_of_shards": 1
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},
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"mappings": {
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"_source": {
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"enabled": false
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},
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"properties": {
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"host_name": {
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"type": "keyword"
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},
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"created_at": {
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"type": "date",
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"format": "EEE MMM dd HH:mm:ss Z yyyy"
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}
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}
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},
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"aliases": {
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"mydata": { }
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}
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},
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"priority": 10,
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"composed_of": ["component_template1", "other_component_template"],
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"version": 3,
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"_meta": {
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"description": "my custom"
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}
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}
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--------------------------------------------------
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// TESTSETUP
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//////////////////////////
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[source,console]
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--------------------------------------------------
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DELETE _index_template/template_*
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DELETE _component_template/*
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--------------------------------------------------
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// TEARDOWN
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//////////////////////////
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[[put-index-template-api-request]]
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==== {api-request-title}
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`PUT /_index_template/<index-template>`
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[[put-index-template-api-desc]]
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==== {api-description-title}
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Creates or updates an index template.
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// tag::index-template-def[]
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Index templates define <<index-modules-settings,settings>> and <<mapping,mappings>> that you can
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automatically apply when creating new indices. {es} applies templates to new indices based on an
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index pattern that matches the index name.
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// end::index-template-def[]
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Index templates are only applied during index creation. Changes to index templates do not affect
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existing indices. Settings and mappings specified in <<indices-create-index, create index>> API
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requests override any settings or mappings specified in an index template.
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===== Comments in index templates
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You can use C-style /* */ block comments in index templates. You can include comments anywhere in
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the request body, except before the opening curly bracket.
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[[getting]]
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===== Getting templates
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[[indices-get-template]]
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=== Get index template API
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++++
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<titleabbrev>Get index template</titleabbrev>
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++++
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Returns information about one or more index templates.
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[source,console]
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--------------------------------------------------
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GET /_index_template/template_1
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--------------------------------------------------
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[[get-template-api-request]]
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==== {api-request-title}
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`GET /_index_template/<index-template>`
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[[get-template-api-path-params]]
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==== {api-path-parms-title}
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include::{docdir}/rest-api/common-parms.asciidoc[tag=index-template]
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+
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To return all index templates, omit this parameter or use a value of `*`.
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[[get-template-api-query-params]]
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==== {api-query-parms-title}
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include::{docdir}/rest-api/common-parms.asciidoc[tag=flat-settings]
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include::{docdir}/rest-api/common-parms.asciidoc[tag=local]
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include::{docdir}/rest-api/common-parms.asciidoc[tag=master-timeout]
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[[get-template-api-example]]
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==== {api-examples-title}
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[[get-template-api-wildcard-ex]]
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===== Get index templates using a wildcard expression
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[source,console]
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--------------------------------------------------
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GET /_index_template/temp*
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--------------------------------------------------
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[[get-template-api-all-ex]]
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===== Get all index templates
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[source,console]
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--------------------------------------------------
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GET /_index_template
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--------------------------------------------------
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[[put-index-template-api-path-params]]
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==== {api-path-parms-title}
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`<index-template>`::
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(Required, string)
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Name of the index template to create.
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[[put-index-template-api-query-params]]
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==== {api-query-parms-title}
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`create`::
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(Optional, boolean)
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If `true`, this request cannot replace or update existing index templates. Defaults to `false`.
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include::{docdir}/rest-api/common-parms.asciidoc[tag=master-timeout]
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[[put-index-template-api-request-body]]
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==== {api-request-body-title}
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`index_patterns`::
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(Required, array of strings)
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Array of wildcard expressions
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used to match the names of indices during creation.
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include::{docdir}/rest-api/common-parms.asciidoc[tag=aliases]
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include::{docdir}/rest-api/common-parms.asciidoc[tag=mappings]
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include::{docdir}/rest-api/common-parms.asciidoc[tag=settings]
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`template`::
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(Optional, object)
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This is the template to be applied, may optionally include a `mappings`,
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`settings`, or `aliases` configuration.
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`composed_of`::
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(Optional, array of strings)
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An ordered list of component template names. Component templates will be merged in the order
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specified, meaning that the last component template specified has the highest precedence. See the
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<<indices-component-template,component template>> reference for information.
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`priority`::
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(Optional, integer)
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Priority to determine index template precedence when a new index is created. The index template with
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2020-05-04 18:19:13 -04:00
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the highest priority is chosen. If no priority is specified the template is treated as though it is
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of priority 0 (lowest priority).
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2020-04-28 18:10:50 -04:00
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This number is not automatically generated by {es}.
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`version`::
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(Optional, integer)
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Version number used to manage index templates externally.
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This number is not automatically generated by {es}.
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`_meta`::
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(Optional, object)
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Optional user metadata about the index template. May have any contents.
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This map is not automatically generated by {es}.
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[[put-index-template-api-example]]
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==== {api-examples-title}
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==== Composing multiple component templates
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When multiple component templates are specified in the `composed_of` field for an index template,
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they are merged in the order specified, meaning that later component templates override earlier
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component templates.
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For two component templates:
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[source,console]
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--------------------------------------------------
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PUT /_component_template/template_with_2_shards
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{
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"template": {
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"settings": {
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"index.number_of_shards": 2
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}
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}
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}
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--------------------------------------------------
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[source,console]
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--------------------------------------------------
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PUT /_component_template/template_with_3_shards
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{
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"template": {
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"settings": {
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"index.number_of_shards": 3
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}
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}
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}
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--------------------------------------------------
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The order they are specified changes the number of shards for an index:
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[source,console]
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--------------------------------------------------
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PUT /_index_template/template_1
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{
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"index_patterns": ["t*"],
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"composed_of": ["template_with_2_shards", "template_with_3_shards"]
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}
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--------------------------------------------------
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In this case, an index matching `t*` will have three primary shards. If the order of composed
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templates were reversed, the index would have two primary shards.
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===== Index template with index aliases
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You can include <<indices-aliases,index aliases>> in an index template.
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[source,console]
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--------------------------------------------------
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PUT _index_template/template_1
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{
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"index_patterns" : ["te*"],
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"template": {
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"settings" : {
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"number_of_shards" : 1
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},
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"aliases" : {
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"alias1" : {},
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"alias2" : {
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"filter" : {
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"term" : {"user" : "kimchy" }
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},
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"routing" : "kimchy"
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},
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"{index}-alias" : {} <1>
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}
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}
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}
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--------------------------------------------------
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<1> the `{index}` placeholder in the alias name will be replaced with the
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actual index name that the template gets applied to, during index creation.
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[[multiple-templates]]
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===== Indices matching multiple templates
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When an index is created that matches multiple index templates, only the index template with the
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highest priority is applied. For example:
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[source,console]
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--------------------------------------------------
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PUT /_index_template/template_1
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{
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"index_patterns" : ["t*"],
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"priority" : 0,
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"template": {
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"settings" : {
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"number_of_shards" : 1,
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"number_of_replicas": 0
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},
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"mappings" : {
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"_source" : { "enabled" : false }
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}
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}
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}
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PUT /_index_template/template_2
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{
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"index_patterns" : ["te*"],
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"priority" : 1,
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"template": {
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"settings" : {
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"number_of_shards" : 2
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},
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"mappings" : {
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"_source" : { "enabled" : true }
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}
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}
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}
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--------------------------------------------------
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For indices that start with `te*`, `_source` will enabled, and the index will have two primary
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shards and one replica, because only `template_2` will be applied.
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NOTE: Multiple templates with overlapping index patterns at the same priority are not allowed, and
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an error will be thrown when attempting to create a template matching an existing index template at
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identical priorities.
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[[versioning-templates]]
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===== Template versioning
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You can use the `version` parameter to add an optional version number to an index template. External
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systems can use these version numbers to simplify template management.
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The `version` parameter is completely optional and not automatically generated by {es}.
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To unset a `version`, replace the template without specifying one.
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[source,console]
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--------------------------------------------------
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PUT /_index_template/template_1
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{
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"index_patterns" : ["foo", "bar"],
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"priority" : 0,
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"template": {
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"settings" : {
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"number_of_shards" : 1
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}
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},
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"version": 123
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}
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--------------------------------------------------
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To check the `version`, you can use the <<indices-get-template, get index template>> API.
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[[template-metadata]]
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===== Template metadata
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You can use the `_meta` parameter to add optional metadata to an index template. This is a
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user-defined map that can contain any data. This data will be stored in the cluster state however,
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so keeping it short is preferrable.
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The `_meta` parameter is completely optional and not automatically generated by {es}.
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To unset `_meta`, replace the template without specifying one.
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[source,console]
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--------------------------------------------------
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PUT /_index_template/template_1
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{
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"index_patterns": ["foo", "bar"],
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"template": {
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"settings" : {
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"number_of_shards" : 3
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}
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},
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"_meta": {
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"description": "set number of shards to three",
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"serialization": {
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"class": "MyIndexTemplate",
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"id": 17
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}
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}
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}
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--------------------------------------------------
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To check the `_meta`, you can use the <<indices-get-template, get index template>> API.
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