300 lines
7.3 KiB
Plaintext
300 lines
7.3 KiB
Plaintext
[[indices-simulate-template]]
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=== Simulate index template API
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++++
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<titleabbrev>Simulate template</titleabbrev>
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++++
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experimental[]
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Returns the index configuration that would be applied by a particular
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<<indices-templates, index template>>.
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////
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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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"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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[source,console]
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--------------------------------------------------
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DELETE _index_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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[source,console]
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--------------------------------------------------
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POST /_index_template/_simulate/template_1
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--------------------------------------------------
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[[simulate-template-api-request]]
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==== {api-request-title}
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`POST /_index_template/_simulate/<index-template>`
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[[simulate-template-api-path-params]]
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==== {api-path-parms-title}
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`<index-template>`::
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(Optional, string)
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Name of the index template to simulate.
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To test a template configuration before you add it to the cluster,
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omit this parameter and specify the template configuration in the request body.
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[[simulate-template-api-query-params]]
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==== {api-query-parms-title}
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////
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`cause`::
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(Optional, string) The reason for using the specified template for the simulation.
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////
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`create`::
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(Optional, boolean) If `true`, the template passed in the body is
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only used if no existing templates match the same index patterns.
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If `false`, the simulation uses the template with the highest priority.
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Note that the template is not permanently added or updated in either case;
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it is only used for the simulation.
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Defaults to `false`.
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
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[[simulate-template-api-request-body]]
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==== {api-request-body-title}
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`composed_of`::
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(Optional, array of strings)
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Ordered list of component template names. Component templates are merged in the order
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specified, meaning that the last component template specified has the highest precedence.
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For an example, see
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<<multiple-component-templates,Composing multiple component templates>>.
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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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`priority`::
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(Optional, integer)
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Priority that determines what template is applied if there are multiple templates
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that match the name of a new index.
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The highest priority template takes precedence. Defaults to `0` (lowest priority).
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`template`::
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(Optional, object)
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Template to apply.
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+
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.Properties of `template`
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[%collapsible%open]
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====
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=aliases]
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=mappings]
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=settings]
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====
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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 version is not automatically generated by {es}.
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`_meta`::
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(Optional, object)
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User-specified metadata for the index template.
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This information is not generated or used by {es}.
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[role="child_attributes"]
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[[simulate-template-api-response-body]]
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==== {api-response-body-title}
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`overlapping`::
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(array) Any templates that were superseded by the specified template.
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+
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.Properties of `overlapping`
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[%collapsible%open]
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====
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`index_patterns`::
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(array) Index patterns that the superseded template applies to.
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`name`::
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(string) Name of the superseded template.
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====
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`template`::
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(object)
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The settings, mappings, and aliases that would be applied to matching indices.
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+
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.Properties of `template`
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[%collapsible%open]
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====
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=aliases]
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=mappings]
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include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=settings]
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====
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[[simulate-template-api-example]]
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==== {api-examples-title}
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[[simulate-existing-template-ex]]
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===== Simulating an existing template
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The following example creates and simulates a composed template:
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[source,console]
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--------------------------------------------------
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PUT /_component_template/ct1 <1>
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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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PUT /_component_template/ct2 <2>
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{
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"template": {
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"settings": {
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"index.number_of_replicas": 0
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},
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"mappings": {
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"properties": {
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"@timestamp": {
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"type": "date"
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}
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}
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}
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}
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}
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PUT /_index_template/final-template <3>
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{
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"index_patterns": ["myindex*"],
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"composed_of": ["ct1", "ct2"],
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"priority": 5
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}
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POST /_index_template/_simulate/final-template <4>
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--------------------------------------------------
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<1> Create a component template (`ct1`) that sets the number of shards to 2
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<2> Create a component template (`ct2`) that sets the number of replicas to 0 and defines a mapping
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<3> Create an index template (`final-template`) that uses the component templates
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<4> Show the configuration applied by the `final-template`
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The response shows the index settings, mappings, and aliases applied by the `final-template`:
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[source,console-result]
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---------------------------------------------------------
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{
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"template" : {
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"settings" : {
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"index" : {
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"number_of_shards" : "2", <1>
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"number_of_replicas" : "0" <2>
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}
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},
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"mappings" : { <3>
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"properties" : {
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"@timestamp" : {
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"type" : "date"
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}
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}
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},
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"aliases" : { }
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},
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"overlapping" : [ ]
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}
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---------------------------------------------------------
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<1> Number of shards from `ct1`
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<2> Number of replicas from `ct2`
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<3> Mappings from `ct1`
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[[simulate-template-config-ex]]
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===== Simulating an arbitrary template configuration
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To see what settings will be applied by a template before you add it to the cluster,
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you can pass a template configuration in the request body.
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The specified template is used for the simulation if it has a higher priority than existing templates.
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[source,console]
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--------------------------------------------------
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POST /_index_template/_simulate
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{
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"index_patterns": ["myindex*"],
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"composed_of": ["ct2"],
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"priority": 10,
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"template": {
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"settings": {
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"index.number_of_replicas": 1
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}
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}
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}
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--------------------------------------------------
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// TEST[continued]
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The response shows any overlapping templates with a lower priority.
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[source,console-result]
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---------------------------------------------------------
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{
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"template" : {
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"settings" : {
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"index" : {
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"number_of_replicas" : "1"
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}
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},
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"mappings" : {
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"properties" : {
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"@timestamp" : {
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"type" : "date"
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}
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}
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},
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"aliases" : { }
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},
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"overlapping" : [
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{
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"name" : "final-template",
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"index_patterns" : [
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"myindex*"
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]
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}
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]
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}
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--------------------------------------------------------- |