Filter query processor
The filter_query search request processor intercepts a search request and applies an additional query to the request, filtering the results. This is useful when you don’t want to rewrite existing queries in your application but need additional filtering of the results.
Request fields
The following table lists all available request fields.
| Field | Data type | Description |
|---|---|---|
query | Object | A query in query domain-specific language (DSL). For a list of Lucenia query types, see Query DSL. Required. |
tag | String | The processor’s identifier. Optional. |
description | String | A description of the processor. Optional. |
ignore_failure | Boolean | If true, Lucenia ignores any failure of this processor and continues to run the remaining processors in the search pipeline. Optional. Default is false. |
Example
The following example demonstrates using a search pipeline with a filter_query processor.
Setup
Create an index named my_index and index two documents, one public and one private:
POST /my_index/_doc/1
{
"message": "This is a public message",
"visibility":"public"
}
POST /my_index/_doc/2
{
"message": "This is a private message",
"visibility": "private"
}
Creating a search pipeline
The following request creates a search pipeline called my_pipeline with a filter_query request processor that uses a term query to return only public messages:
PUT /_search/pipeline/my_pipeline
{
"request_processors": [
{
"filter_query" : {
"tag" : "tag1",
"description" : "This processor is going to restrict to publicly visible documents",
"query" : {
"term": {
"visibility": "public"
}
}
}
}
]
}
Using a search pipeline
Search for documents in my_index without a search pipeline:
GET /my_index/_search
The response contains both documents:
Response
{
"took" : 47,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "my_index",
"_id" : "1",
"_score" : 1.0,
"_source" : {
"message" : "This is a public message",
"visibility" : "public"
}
},
{
"_index" : "my_index",
"_id" : "2",
"_score" : 1.0,
"_source" : {
"message" : "This is a private message",
"visibility" : "private"
}
}
]
}
}
To search with a pipeline, specify the pipeline name in the search_pipeline query parameter:
GET /my_index/_search?search_pipeline=my_pipeline
The response contains only the document with public visibility:
Response
{
"took" : 19,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 1,
"relation" : "eq"
},
"max_score" : 0.0,
"hits" : [
{
"_index" : "my_index",
"_id" : "1",
"_score" : 0.0,
"_source" : {
"message" : "This is a public message",
"visibility" : "public"
}
}
]
}
}