elasticsearchHow do I group data using Elasticsearch?
Grouping data in Elasticsearch is a powerful way to aggregate and analyze data. To do this, you need to use the aggregations
feature of Elasticsearch. Aggregations allow you to group data by a certain criteria, such as a certain field or range of values.
For example, the following code will group documents by the color
field:
GET /_search
{
"size": 0,
"aggs": {
"colors": {
"terms": {
"field": "color"
}
}
}
}
The output of this query will look something like this:
{
...
"aggregations": {
"colors": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{
"key": "red",
"doc_count": 10
},
{
"key": "blue",
"doc_count": 5
},
{
"key": "green",
"doc_count": 3
}
]
}
}
}
The code consists of the following parts:
GET /_search
- This is the endpoint used to query Elasticsearch.size: 0
- This tells Elasticsearch to not return any documents, just the aggregations.aggs
- This is the object that contains the aggregation definitions.terms
- This is the type of aggregation used. It groups documents by a certain field.field
- This is the field that the documents will be grouped by.
For more information about Elasticsearch aggregations, please refer to the official documentation.
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