Reverts "[CI] Removes log formatter for RSpec in API"

Brings back the log formatter for test name results in Buildkite

This reverts commit 5570fe7.

Author: picandocodigo

elasticsearch-api/spec/rspec_formatter.rb

@@ -0,0 +1,31 @@
+# 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.
+
+class RSpecCustomFormatter < RSpec::Core::Formatters::JsonFormatter
+  RSpec::Core::Formatters.register self
+
+  LOGFILE = File.new("tmp/rspec-#{ENV['TEST_SUITE']}-#{RUBY_VERSION}.log", 'w')
+
+  def close(_notification)
+    @output_hash[:examples].map do |example|
+      regexp = /\S+\/\S+/
+      filename = example[:full_description].match(/\S+\/\S+/)[0]
+      log ="#{filename} | #{example[:status]} | #{example[:run_time]} | #{example[:full_description]}\n"
+      File.write(LOGFILE, log, mode: 'a')
+    end
+  end
+end

elasticsearch-api/spec/spec_helper.rb

@@ -64,6 +64,10 @@ def self.included(context)
   else
     config.add_formatter('RSpec::Core::Formatters::HtmlFormatter', "tmp/elasticsearch-#{ENV['TEST_SUITE']}-#{RUBY_VERSION}.html")
   end
+  if ENV['BUILDKITE']
+    require_relative "./rspec_formatter.rb"
+    config.add_formatter('RSpecCustomFormatter')
+  end
   config.color_mode = :on
 end