176 lines
4.8 KiB
Plaintext
176 lines
4.8 KiB
Plaintext
[[indices-create-index]]
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== Create Index
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The create index API allows to instantiate an index. Elasticsearch
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provides support for multiple indices, including executing operations
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across several indices.
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[float]
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[[create-index-settings]]
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=== Index Settings
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Each index created can have specific settings
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associated with it.
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[source,js]
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--------------------------------------------------
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PUT twitter
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{
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"settings" : {
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"index" : {
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"number_of_shards" : 3, <1>
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"number_of_replicas" : 2 <2>
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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<1> Default for `number_of_shards` is 5
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<2> Default for `number_of_replicas` is 1 (ie one replica for each primary shard)
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The above second curl example shows how an index called `twitter` can be
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created with specific settings for it using http://www.yaml.org[YAML].
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In this case, creating an index with 3 shards, each with 2 replicas. The
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index settings can also be defined with http://www.json.org[JSON]:
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[source,js]
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--------------------------------------------------
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PUT twitter
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{
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"settings" : {
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"index" : {
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"number_of_shards" : 3,
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"number_of_replicas" : 2
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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or more simplified
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[source,js]
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--------------------------------------------------
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PUT twitter
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{
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"settings" : {
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"number_of_shards" : 3,
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"number_of_replicas" : 2
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}
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}
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--------------------------------------------------
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// CONSOLE
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[NOTE]
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You do not have to explicitly specify `index` section inside the
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`settings` section.
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For more information regarding all the different index level settings
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that can be set when creating an index, please check the
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<<index-modules,index modules>> section.
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[float]
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[[mappings]]
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=== Mappings
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The create index API allows to provide a set of one or more mappings:
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[source,js]
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--------------------------------------------------
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PUT test
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{
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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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"properties" : {
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"field1" : { "type" : "text" }
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}
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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[float]
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[[create-index-aliases]]
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=== Aliases
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The create index API allows also to provide a set of <<indices-aliases,aliases>>:
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[source,js]
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--------------------------------------------------
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PUT test
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{
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"aliases" : {
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"alias_1" : {},
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"alias_2" : {
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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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}
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}
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--------------------------------------------------
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// CONSOLE
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[float]
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[[create-index-wait-for-active-shards]]
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=== Wait For Active Shards
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By default, index creation will only return a response to the client when the primary copies of
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each shard have been started, or the request times out. The index creation response will indicate
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what happened:
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[source,js]
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--------------------------------------------------
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{
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"acknowledged": true,
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"shards_acknowledged": true,
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"index": "test"
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}
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--------------------------------------------------
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// TESTRESPONSE
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`acknowledged` indicates whether the index was successfully created in the cluster, while
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`shards_acknowledged` indicates whether the requisite number of shard copies were started for
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each shard in the index before timing out. Note that it is still possible for either
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`acknowledged` or `shards_acknowledged` to be `false`, but the index creation was successful.
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These values simply indicate whether the operation completed before the timeout. If
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`acknowledged` is `false`, then we timed out before the cluster state was updated with the
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newly created index, but it probably will be created sometime soon. If `shards_acknowledged`
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is `false`, then we timed out before the requisite number of shards were started (by default
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just the primaries), even if the cluster state was successfully updated to reflect the newly
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created index (i.e. `acknowledged=true`).
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We can change the default of only waiting for the primary shards to start through the index
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setting `index.write.wait_for_active_shards` (note that changing this setting will also affect
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the `wait_for_active_shards` value on all subsequent write operations):
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[source,js]
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--------------------------------------------------
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PUT test
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{
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"settings": {
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"index.write.wait_for_active_shards": "2"
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[skip:requires two nodes]
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or through the request parameter `wait_for_active_shards`:
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[source,js]
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--------------------------------------------------
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PUT test?wait_for_active_shards=2
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--------------------------------------------------
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// CONSOLE
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// TEST[skip:requires two nodes]
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A detailed explanation of `wait_for_active_shards` and its possible values can be found
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<<index-wait-for-active-shards,here>>.
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