176 lines
4.6 KiB
Plaintext
176 lines
4.6 KiB
Plaintext
[[indices-templates]]
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== Index Templates
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Index templates allow you to define templates that will automatically be
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applied when new indices are created. The templates include both settings and
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mappings, and a simple pattern template that controls whether the template
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should be applied to the new index.
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NOTE: Templates are only applied at index creation time. Changing a template
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will have no impact on existing indices.
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For example:
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[source,js]
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--------------------------------------------------
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PUT _template/template_1
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{
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"template": "te*",
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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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"type1": {
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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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}
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}
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--------------------------------------------------
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// AUTOSENSE
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Defines a template named template_1, with a template pattern of `te*`.
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The settings and mappings will be applied to any index name that matches
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the `te*` template.
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It is also possible to include aliases in an index template as follows:
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[source,js]
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--------------------------------------------------
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curl -XPUT localhost:9200/_template/template_1 -d '
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{
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"template" : "te*",
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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 within 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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[float]
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[[delete]]
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=== Deleting a Template
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Index templates are identified by a name (in the above case
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`template_1`) and can be deleted as well:
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[source,js]
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--------------------------------------------------
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curl -XDELETE localhost:9200/_template/template_1
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--------------------------------------------------
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[float]
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[[getting]]
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=== Getting templates
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Index templates are identified by a name (in the above case
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`template_1`) and can be retrieved using the following:
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[source,js]
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--------------------------------------------------
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curl -XGET localhost:9200/_template/template_1
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--------------------------------------------------
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You can also match several templates by using wildcards like:
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[source,js]
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--------------------------------------------------
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curl -XGET localhost:9200/_template/temp*
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curl -XGET localhost:9200/_template/template_1,template_2
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--------------------------------------------------
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To get list of all index templates you can run:
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[source,js]
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--------------------------------------------------
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curl -XGET localhost:9200/_template/
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--------------------------------------------------
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[float]
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[[indices-templates-exists]]
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=== Templates exists
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Used to check if the template exists or not. For example:
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[source,js]
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-----------------------------------------------
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curl -XHEAD -i localhost:9200/_template/template_1
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-----------------------------------------------
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The HTTP status code indicates if the template with the given name
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exists or not. A status code `200` means it exists, a `404` it does not.
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[float]
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[[multiple-templates]]
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=== Multiple Template Matching
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Multiple index templates can potentially match an index, in this case,
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both the settings and mappings are merged into the final configuration
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of the index. The order of the merging can be controlled using the
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`order` parameter, with lower order being applied first, and higher
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orders overriding them. For example:
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[source,js]
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--------------------------------------------------
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curl -XPUT localhost:9200/_template/template_1 -d '
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{
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"template" : "*",
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"order" : 0,
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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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"type1" : {
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"_source" : { "enabled" : false }
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}
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}
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}
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'
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curl -XPUT localhost:9200/_template/template_2 -d '
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{
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"template" : "te*",
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"order" : 1,
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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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"type1" : {
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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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--------------------------------------------------
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The above will disable storing the `_source` on all `type1` types, but
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for indices of that start with `te*`, source will still be enabled.
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Note, for mappings, the merging is "deep", meaning that specific
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object/property based mappings can easily be added/overridden on higher
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order templates, with lower order templates providing the basis.
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