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[[search-aggregations-bucket-filter-aggregation]]
=== Filter Aggregation
Defines a single bucket of all the documents in the current document set context that match a specified filter. Often this will be used to narrow down the current aggregation context to a specific set of documents.
Example:
[source,js]
--------------------------------------------------
{
"aggs" : {
"in_stock_products" : {
"filter" : { "range" : { "stock" : { "gt" : 0 } } },
"aggs" : {
"avg_price" : { "avg" : { "field" : "price" } }
}
}
}
}
--------------------------------------------------
In the above example, we calculate the average price of all the products that are currently in-stock.
Response:
[source,js]
--------------------------------------------------
{
...
"aggs" : {
"in_stock_products" : {
"doc_count" : 100,
"avg_price" : { "value" : 56.3 }
}
}
}
--------------------------------------------------
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