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# the Apache License, Version 2.0 (the "License"); you may
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# 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,
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module Elasticsearch
  module API
    module Indices
      module Actions
        # Performs the flush operation on one or more indices.
        #
        # @option arguments [List] :index A comma-separated list of index names; use `_all` or empty string for all indices
        # @option arguments [Boolean] :force Whether a flush should be forced even if it is not necessarily needed ie. if no changes will be committed to the index. This is useful if transaction log IDs should be incremented even if no uncommitted changes are present. (This setting can be considered as internal)
        # @option arguments [Boolean] :wait_if_ongoing If set to true the flush operation will block until the flush can be executed if another flush operation is already executing. The default is true. If set to false the flush will be skipped iff if another flush operation is already running.
        # @option arguments [Boolean] :ignore_unavailable Whether specified concrete indices should be ignored when unavailable (missing or closed)
        # @option arguments [Boolean] :allow_no_indices Whether to ignore if a wildcard indices expression resolves into no concrete indices. (This includes `_all` string or when no indices have been specified)
        # @option arguments [String] :expand_wildcards Whether to expand wildcard expression to concrete indices that are open, closed or both. (options: open, closed, hidden, none, all)
        # @option arguments [Hash] :headers Custom HTTP headers
        #
        # @see https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-flush.html
        #
        def flush(arguments = {})
          headers = arguments.delete(:headers) || {}

          body = nil

          arguments = arguments.clone

          _index = arguments.delete(:index)

          method = Elasticsearch::API::HTTP_POST
          path   = if _index
                     "#{Utils.__listify(_index)}/_flush"
                   else
                     "_flush"
                   end
          params = Utils.process_params(arguments)

          Elasticsearch::API::Response.new(
            perform_request(method, path, params, body, headers)
          )
        end
      end
    end
  end
end