67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
[[search-aggregations-bucket-global-aggregation]]
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=== Global Aggregation
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Defines a single bucket of all the documents within the search execution
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context. This context is defined by the indices and the document types you're
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searching on, but is *not* influenced by the search query itself.
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NOTE: Global aggregators can only be placed as top level aggregators because
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it doesn't make sense to embed a global aggregator within another
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bucket aggregator.
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Example:
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[source,console]
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--------------------------------------------------
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POST /sales/_search?size=0
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{
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"query": {
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"match": { "type": "t-shirt" }
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},
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"aggs": {
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"all_products": {
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"global": {}, <1>
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"aggs": { <2>
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"avg_price": { "avg": { "field": "price" } }
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}
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},
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"t_shirts": { "avg": { "field": "price" } }
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}
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}
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--------------------------------------------------
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// TEST[setup:sales]
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<1> The `global` aggregation has an empty body
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<2> The sub-aggregations that are registered for this `global` aggregation
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The above aggregation demonstrates how one would compute aggregations
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(`avg_price` in this example) on all the documents in the search context,
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regardless of the query (in our example, it will compute the average price over
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all products in our catalog, not just on the "shirts").
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The response for the above aggregation:
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[source,console-result]
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--------------------------------------------------
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{
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...
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"aggregations": {
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"all_products": {
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"doc_count": 7, <1>
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"avg_price": {
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"value": 140.71428571428572 <2>
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}
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},
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"t_shirts": {
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"value": 128.33333333333334 <3>
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/\.\.\./"took": $body.took,"timed_out": false,"_shards": $body._shards,"hits": $body.hits,/]
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<1> The number of documents that were aggregated (in our case, all documents
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within the search context)
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<2> The average price of all products in the index
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<3> The average price of all t-shirts
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