- Elasticsearch Guide: other versions:
- Getting Started
- Set up Elasticsearch
- Installing Elasticsearch
- Configuring Elasticsearch
- Important Elasticsearch configuration
- Important System Configuration
- Bootstrap Checks
- Heap size check
- File descriptor check
- Memory lock check
- Maximum number of threads check
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- Early-access check
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- All permission check
- Starting Elasticsearch
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- Upgrade Elasticsearch
- API Conventions
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- Search APIs
- Aggregations
- Metrics Aggregations
- Avg Aggregation
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- Cardinality Aggregation
- Extended Stats Aggregation
- Geo Bounds Aggregation
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- Max Aggregation
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- Percentiles Aggregation
- Percentile Ranks Aggregation
- Scripted Metric Aggregation
- Stats Aggregation
- Sum Aggregation
- Top Hits Aggregation
- Value Count Aggregation
- Bucket Aggregations
- Adjacency Matrix Aggregation
- Auto-interval Date Histogram Aggregation
- Intervals
- Children Aggregation
- Composite Aggregation
- Date Histogram Aggregation
- Date Range Aggregation
- Diversified Sampler Aggregation
- Filter Aggregation
- Filters Aggregation
- Geo Distance Aggregation
- GeoHash grid Aggregation
- Global Aggregation
- Histogram Aggregation
- IP Range Aggregation
- Missing Aggregation
- Nested Aggregation
- Range Aggregation
- Reverse nested Aggregation
- Sampler Aggregation
- Significant Terms Aggregation
- Significant Text Aggregation
- Terms Aggregation
- Pipeline Aggregations
- Avg Bucket Aggregation
- Derivative Aggregation
- Max Bucket Aggregation
- Min Bucket Aggregation
- Sum Bucket Aggregation
- Stats Bucket Aggregation
- Extended Stats Bucket Aggregation
- Percentiles Bucket Aggregation
- Moving Average Aggregation
- Moving Function Aggregation
- Cumulative Sum Aggregation
- Bucket Script Aggregation
- Bucket Selector Aggregation
- Bucket Sort Aggregation
- Serial Differencing Aggregation
- Matrix Aggregations
- Caching heavy aggregations
- Returning only aggregation results
- Aggregation Metadata
- Returning the type of the aggregation
- Metrics Aggregations
- Indices APIs
- Create Index
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- Path Hierarchy Tokenizer Examples
- Token Filters
- Standard Token Filter
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- Exclude mode settings example
- Classic Token Filter
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- Character Filters
- Modules
- Index Modules
- Ingest Node
- Pipeline Definition
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- Processors
- Append Processor
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- SQL Access
- Monitor a cluster
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- Secure a cluster
- Overview
- Configuring security
- Encrypting communications in Elasticsearch
- Encrypting communications in an Elasticsearch Docker Container
- Enabling cipher suites for stronger encryption
- Separating node-to-node and client traffic
- Configuring an Active Directory realm
- Configuring a file realm
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- FIPS 140-2
- Security settings
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- Controlling the user cache
- Configuring SAML single-sign-on on the Elastic Stack
- User authorization
- Auditing security events
- Encrypting communications
- Restricting connections with IP filtering
- Cross cluster search, tribe, clients, and integrations
- Tutorial: Getting started with security
- Tutorial: Encrypting communications
- Troubleshooting
- Can’t log in after upgrading to 6.5.4
- Some settings are not returned via the nodes settings API
- Authorization exceptions
- Users command fails due to extra arguments
- Users are frequently locked out of Active Directory
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- How To
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- Add events to calendar
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- Rollup APIs
- Security APIs
- Authenticate
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- Get role mappings
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- Get token
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- Has privileges
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- Watcher APIs
- Definitions
- Release Highlights
- Breaking changes
- Release Notes
- Elasticsearch version 6.5.4
- Elasticsearch version 6.5.3
- Elasticsearch version 6.5.2
- Elasticsearch version 6.5.1
- Elasticsearch version 6.5.0
- Elasticsearch version 6.4.3
- Elasticsearch version 6.4.2
- Elasticsearch version 6.4.1
- Elasticsearch version 6.4.0
- Elasticsearch version 6.3.2
- Elasticsearch version 6.3.1
- Elasticsearch version 6.3.0
- Elasticsearch version 6.2.4
- Elasticsearch version 6.2.3
- Elasticsearch version 6.2.2
- Elasticsearch version 6.2.1
- Elasticsearch version 6.2.0
- Elasticsearch version 6.1.4
- Elasticsearch version 6.1.3
- Elasticsearch version 6.1.2
- Elasticsearch version 6.1.1
- Elasticsearch version 6.1.0
- Elasticsearch version 6.0.1
- Elasticsearch version 6.0.0
- Elasticsearch version 6.0.0-rc2
- Elasticsearch version 6.0.0-rc1
- Elasticsearch version 6.0.0-beta2
- Elasticsearch version 6.0.0-beta1
- Elasticsearch version 6.0.0-alpha2
- Elasticsearch version 6.0.0-alpha1
- Elasticsearch version 6.0.0-alpha1 (Changes previously released in 5.x)
Bucket Sort Aggregation
editBucket Sort Aggregation
editA parent pipeline aggregation which sorts the buckets of its parent multi-bucket aggregation.
Zero or more sort fields may be specified together with the corresponding sort order.
Each bucket may be sorted based on its _key
, _count
or its sub-aggregations.
In addition, parameters from
and size
may be set in order to truncate the result buckets.
The bucket_sort
aggregation, like all pipeline aggregations, is executed after all other non-pipeline aggregations.
This means the sorting only applies to whatever buckets are already returned from the parent aggregation. For example,
if the parent aggregation is terms
and its size
is set to 10
, the bucket_sort
will only sort over those 10
returned term buckets.
Syntax
editA bucket_sort
aggregation looks like this in isolation:
{ "bucket_sort": { "sort": [ {"sort_field_1": {"order": "asc"}}, {"sort_field_2": {"order": "desc"}}, "sort_field_3" ], "from": 1, "size": 3 } }
Here, |
Table 26. bucket_sort
Parameters
Parameter Name | Description | Required | Default Value |
---|---|---|---|
|
The list of fields to sort on. See |
Optional |
|
|
Buckets in positions prior to the set value will be truncated. |
Optional |
|
|
The number of buckets to return. Defaults to all buckets of the parent aggregation. |
Optional |
|
|
The policy to apply when gaps are found in the data (see Dealing with gaps in the data for more details) |
Optional |
|
The following snippet returns the buckets corresponding to the 3 months with the highest total sales in descending order:
POST /sales/_search { "size": 0, "aggs" : { "sales_per_month" : { "date_histogram" : { "field" : "date", "interval" : "month" }, "aggs": { "total_sales": { "sum": { "field": "price" } }, "sales_bucket_sort": { "bucket_sort": { "sort": [ {"total_sales": {"order": "desc"}} ], "size": 3 } } } } } }
|
|
|
And the following may be the response:
{ "took": 82, "timed_out": false, "_shards": ..., "hits": ..., "aggregations": { "sales_per_month": { "buckets": [ { "key_as_string": "2015/01/01 00:00:00", "key": 1420070400000, "doc_count": 3, "total_sales": { "value": 550.0 } }, { "key_as_string": "2015/03/01 00:00:00", "key": 1425168000000, "doc_count": 2, "total_sales": { "value": 375.0 }, }, { "key_as_string": "2015/02/01 00:00:00", "key": 1422748800000, "doc_count": 2, "total_sales": { "value": 60.0 }, } ] } } }
Truncating without sorting
editIt is also possible to use this aggregation in order to truncate the result buckets
without doing any sorting. To do so, just use the from
and/or size
parameters
without specifying sort
.
The following example simply truncates the result so that only the second bucket is returned:
POST /sales/_search { "size": 0, "aggs" : { "sales_per_month" : { "date_histogram" : { "field" : "date", "interval" : "month" }, "aggs": { "bucket_truncate": { "bucket_sort": { "from": 1, "size": 1 } } } } } }
Response:
{ "took": 11, "timed_out": false, "_shards": ..., "hits": ..., "aggregations": { "sales_per_month": { "buckets": [ { "key_as_string": "2015/02/01 00:00:00", "key": 1422748800000, "doc_count": 2 } ] } } }
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