# 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.
#
# This code was automatically generated from the Elasticsearch Specification
# See https://github.com/elastic/elasticsearch-specification
# See Elasticsearch::ES_SPECIFICATION_COMMIT for commit hash.
module Elasticsearch
  module API
    module Transform
      module Actions
        # Start a transform.
        # When you start a transform, it creates the destination index if it does not already exist. The `number_of_shards` is
        # set to `1` and the `auto_expand_replicas` is set to `0-1`. If it is a pivot transform, it deduces the mapping
        # definitions for the destination index from the source indices and the transform aggregations. If fields in the
        # destination index are derived from scripts (as in the case of `scripted_metric` or `bucket_script` aggregations),
        # the transform uses dynamic mappings unless an index template exists. If it is a latest transform, it does not deduce
        # mapping definitions; it uses dynamic mappings. To use explicit mappings, create the destination index before you
        # start the transform. Alternatively, you can create an index template, though it does not affect the deduced mappings
        # in a pivot transform.
        # When the transform starts, a series of validations occur to ensure its success. If you deferred validation when you
        # created the transform, they occur when you start the transform—​with the exception of privilege checks. When
        # Elasticsearch security features are enabled, the transform remembers which roles the user that created it had at the
        # time of creation and uses those same roles. If those roles do not have the required privileges on the source and
        # destination indices, the transform fails when it attempts unauthorized operations.
        #
        # @option arguments [String] :transform_id Identifier for the transform. (*Required*)
        # @option arguments [Time] :timeout Period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error. Server default: 30s.
        # @option arguments [String] :from Restricts the set of transformed entities to those changed after this time. Relative times like now-30d are supported. Only applicable for continuous transforms.
        # @option arguments [Boolean] :error_trace When set to `true` Elasticsearch will include the full stack trace of errors
        #  when they occur.
        # @option arguments [String, Array<String>] :filter_path Comma-separated list of filters in dot notation which reduce the response
        #  returned by Elasticsearch.
        # @option arguments [Boolean] :human When set to `true` will return statistics in a format suitable for humans.
        #  For example `"exists_time": "1h"` for humans and
        #  `"exists_time_in_millis": 3600000` for computers. When disabled the human
        #  readable values will be omitted. This makes sense for responses being consumed
        #  only by machines.
        # @option arguments [Boolean] :pretty If set to `true` the returned JSON will be "pretty-formatted". Only use
        #  this option for debugging only.
        # @option arguments [Hash] :headers Custom HTTP headers
        #
        # @see https://www.elastic.co/docs/api/doc/elasticsearch/v9/operation-transform-start-transform
        #
        def start_transform(arguments = {})
          request_opts = { endpoint: arguments[:endpoint] || 'transform.start_transform' }

          defined_params = [:transform_id].each_with_object({}) do |variable, set_variables|
            set_variables[variable] = arguments[variable] if arguments.key?(variable)
          end
          request_opts[:defined_params] = defined_params unless defined_params.empty?

          raise ArgumentError, "Required argument 'transform_id' missing" unless arguments[:transform_id]

          arguments = arguments.clone
          headers = arguments.delete(:headers) || {}

          body = nil

          _transform_id = arguments.delete(:transform_id)

          method = Elasticsearch::API::HTTP_POST
          path   = "_transform/#{Utils.listify(_transform_id)}/_start"
          params = Utils.process_params(arguments)

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