118 lines
3.7 KiB
Plaintext
118 lines
3.7 KiB
Plaintext
[chapter]
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[[data-streams]]
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= Data Streams
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You can use data streams to index time-based data that's continuously generated.
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A data stream groups indices from the same time-based data source.
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A data stream tracks its indices, known as _backing indices_, using an ordered
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list.
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A data stream's backing indices are <<index-hidden,hidden>>.
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While all backing indices handle read requests, the most recently created
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backing index is the data stream's only write index. A data stream only
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accepts <<docs-index_,index requests>> with `op_type` set to `create`. To update
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or delete specific documents in a data stream, submit a <<docs-delete,delete>>
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or <<docs-update,update>> API request to the backing index containing the
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document.
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To create a data stream, set up a <<indices-templates,composable index
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template>> containing:
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* A name or wildcard pattern for the data stream in the `index_patterns` property.
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* A `data_stream` definition that contains the `timestamp_field` property.
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The `timestamp_field` must be the primary timestamp field
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for the data source. This field must be included in every
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document indexed to the data stream.
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When you index one or more documents to a not-yet-existent target matching
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the template's name or pattern, {es} automatically creates the corresponding
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data stream. You can also manually create a data stream using the
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<<indices-create-data-stream,create data stream API>>. However, a composable
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template for the stream is still required.
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You can use the <<indices-rollover-index,rollover API>> to roll a data stream
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over to a new index when the current write index meets specified criteria, such
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as a maximum age or size. A rollover creates a new backing index and updates the
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data stream's list of backing indices. This new index then becomes the stream's
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new write index. See <<rollover-data-stream-ex>>.
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[discrete]
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[[create-data-stream]]
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== Create a data stream
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Create a composable template with a `data_stream` definition:
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[source,console]
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-----------------------------------
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PUT /_index_template/logs_template
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{
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"index_patterns": ["logs-*"],
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"data_stream": {
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"timestamp_field": "@timestamp"
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}
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}
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-----------------------------------
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Start indexing data to a target matching composable template's wildcard pattern:
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[source,console]
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----
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POST /logs-foobar/_doc
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{
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"@timestamp": "2050-11-15T14:12:12",
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...
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}
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----
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// TEST[continued]
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// TEST[s/,//]
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// TEST[s/\.\.\.//]
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Response:
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[source,console-result]
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--------------------------------------------------
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{
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"_shards" : {
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"total" : 2,
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"failed" : 0,
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"successful" : 1
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},
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"_index" : "logs-foobar-000001",
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"_type" : "_doc",
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"_id" : "W0tpsmIBdwcYyG50zbta",
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"_version" : 1,
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"_seq_no" : 0,
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"_primary_term" : 1,
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"result": "created"
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}
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--------------------------------------------------
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// TESTRESPONSE[s/W0tpsmIBdwcYyG50zbta/$body._id/]
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Or create a data stream using the create data stream API:
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[source,console]
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--------------------------------------------------
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PUT /_data_stream/logs-barbaz
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--------------------------------------------------
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// TEST[continued]
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////
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[source,console]
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-----------------------------------
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DELETE /_data_stream/logs-foobar
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DELETE /_data_stream/logs-barbaz
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DELETE /_index_template/logs_template
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-----------------------------------
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// TEST[continued]
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////
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[discrete]
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[[data-streams-apis]]
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== Data stream APIs
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The following APIs are available for managing data streams:
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* To get information about data streams, use the <<indices-get-data-stream, get data stream API>>.
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* To delete data streams, use the <<indices-delete-data-stream, delete data stream API>>.
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* To manually create a data stream, use the <<indices-create-data-stream, create data stream API>>.
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