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# Licensed to Elasticsearch B.V. under one or more contributor
# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch B.V. licenses this file to you under
# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
module Elasticsearch
module DSL
module Search
module Queries
# Returns documents that have at least one non-null value in the field.
#
# @example Find documents with non-empty "name" property
#
# search do
# query do
# exists do
# field 'name'
# end
# end
# end
#
# @note The "Exists" query can be used as a "Missing" query in a "Bool" query "Must Not" context.
#
# @example Find documents with an empty "name" property
#
# search do
# query do
# bool do
# must_not do
# exists do
# field 'name'
# end
# end
# end
# end
# end
#
# @see https://www.elastic.co/guide/en/elasticsearch/reference/5.1/query-dsl-exists-query.html
#
class Exists
include BaseComponent
option_method :field
end
end
end
end
end
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