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6b67e0bf2f
`_search_shards`API today only returns aliases names if there is an alias filter associated with one of them. Now it can be useful to see which aliases have been expanded for an index given the index expressions. This change also includes non-filtering aliases even without a filtering alias being present.
168 lines
4.6 KiB
Plaintext
168 lines
4.6 KiB
Plaintext
[[search-shards]]
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== Search Shards API
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The search shards api returns the indices and shards that a search request would
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be executed against. This can give useful feedback for working out issues or
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planning optimizations with routing and shard preferences. When filtered aliases
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are used, the filter is returned as part of the `indices` section [5.1.0] Added in 5.1.0.
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The `index` may be a single value, or comma-separated.
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[float]
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=== Usage
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Full example:
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[source,js]
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--------------------------------------------------
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GET /twitter/_search_shards
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--------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT twitter\n/]
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This will yield the following result:
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[source,js]
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--------------------------------------------------
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{
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"nodes": ...,
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"indices" : {
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"twitter": { }
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},
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"shards": [
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 0,
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"state": "STARTED",
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"allocation_id": {"id":"0TvkCyF7TAmM1wHP4a42-A"},
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"relocating_node": null
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}
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],
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 1,
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"state": "STARTED",
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"allocation_id": {"id":"fMju3hd1QHWmWrIgFnI4Ww"},
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"relocating_node": null
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}
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],
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 2,
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"state": "STARTED",
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"allocation_id": {"id":"Nwl0wbMBTHCWjEEbGYGapg"},
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"relocating_node": null
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}
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],
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 3,
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"state": "STARTED",
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"allocation_id": {"id":"bU_KLGJISbW0RejwnwDPKw"},
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"relocating_node": null
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}
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],
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 4,
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"state": "STARTED",
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"allocation_id": {"id":"DMs7_giNSwmdqVukF7UydA"},
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"relocating_node": null
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}
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]
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]
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"nodes": ...,/"nodes": $body.nodes,/]
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// TESTRESPONSE[s/JklnKbD7Tyqi9TP3_Q_tBg/$body.shards.0.0.node/]
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// TESTRESPONSE[s/0TvkCyF7TAmM1wHP4a42-A/$body.shards.0.0.allocation_id.id/]
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// TESTRESPONSE[s/fMju3hd1QHWmWrIgFnI4Ww/$body.shards.1.0.allocation_id.id/]
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// TESTRESPONSE[s/Nwl0wbMBTHCWjEEbGYGapg/$body.shards.2.0.allocation_id.id/]
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// TESTRESPONSE[s/bU_KLGJISbW0RejwnwDPKw/$body.shards.3.0.allocation_id.id/]
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// TESTRESPONSE[s/DMs7_giNSwmdqVukF7UydA/$body.shards.4.0.allocation_id.id/]
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And specifying the same request, this time with a routing value:
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[source,js]
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--------------------------------------------------
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GET /twitter/_search_shards?routing=foo,baz
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--------------------------------------------------
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// CONSOLE
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// TEST[s/^/PUT twitter\n/]
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This will yield the following result:
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[source,js]
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--------------------------------------------------
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{
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"nodes": ...,
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"indices" : {
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"twitter": { }
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},
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"shards": [
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 0,
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"state": "STARTED",
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"allocation_id": {"id":"0TvkCyF7TAmM1wHP4a42-A"},
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"relocating_node": null
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}
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],
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[
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{
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"index": "twitter",
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"node": "JklnKbD7Tyqi9TP3_Q_tBg",
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"primary": true,
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"shard": 1,
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"state": "STARTED",
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"allocation_id": {"id":"fMju3hd1QHWmWrIgFnI4Ww"},
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"relocating_node": null
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}
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]
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]
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"nodes": ...,/"nodes": $body.nodes,/]
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// TESTRESPONSE[s/JklnKbD7Tyqi9TP3_Q_tBg/$body.shards.0.0.node/]
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// TESTRESPONSE[s/0TvkCyF7TAmM1wHP4a42-A/$body.shards.0.0.allocation_id.id/]
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// TESTRESPONSE[s/fMju3hd1QHWmWrIgFnI4Ww/$body.shards.1.0.allocation_id.id/]
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This time the search will only be executed against two of the shards, because
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routing values have been specified.
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[float]
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=== All parameters:
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[horizontal]
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`routing`::
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A comma-separated list of routing values to take into account when
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determining which shards a request would be executed against.
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`preference`::
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Controls a `preference` of which shard replicas to execute the search
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request on. By default, the operation is randomized between the shard
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replicas. See the link:search-request-preference.html[preference]
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documentation for a list of all acceptable values.
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`local`::
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A boolean value whether to read the cluster state locally in order to
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determine where shards are allocated instead of using the Master node's
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cluster state. |