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[[query-dsl-bool-filter]]
=== Bool Filter
A filter that matches documents matching boolean combinations of other
queries. Similar in concept to
<<query-dsl-bool-query,Boolean query>>, except
that the clauses are other filters. Can be placed within queries that
accept a filter.
[source,js]
--------------------------------------------------
{
"filtered" : {
"query" : {
"queryString" : {
"default_field" : "message",
"query" : "elasticsearch"
}
},
"filter" : {
"bool" : {
"must" : {
"term" : { "tag" : "wow" }
},
"must_not" : {
"range" : {
"age" : { "from" : 10, "to" : 20 }
}
},
"should" : [
{
"term" : { "tag" : "sometag" }
},
{
"term" : { "tag" : "sometagtag" }
}
]
}
}
}
}
--------------------------------------------------
[float]
==== Caching
The result of the `bool` filter is not cached by default (though
internal filters might be). The `_cache` can be set to `true` in order
to enable caching.
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