[API] Added the "Get Indices Info" API

Related: elastic/elasticsearch#7234, elasticsearch/elasticsearch/#4069

Author: karmi

elasticsearch-api/lib/elasticsearch/api/actions/indices/get.rb

@@ -0,0 +1,41 @@
+module Elasticsearch
+  module API
+    module Indices
+      module Actions
+
+        # Retrieve information about one or more indices
+        #
+        # @option arguments [List] :index A comma-separated list of index names (*Required*)
+        # @option arguments [List] :feature A comma-separated list of features
+        # @option arguments [Boolean] :local Return local information, do not retrieve the state from master node
+        #                                    (default: false)
+        # @option arguments [Boolean] :ignore_unavailable Ignore unavailable indexes (default: false)
+        # @option arguments [Boolean] :allow_no_indices Ignore if a wildcard expression resolves to no concrete
+        #                                               indices (default: false)
+        # @option arguments [List] :expand_wildcards Whether wildcard expressions should get expanded
+        #                                            to open or closed indices (default: open)
+        #
+        # @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/indices-get-index.html
+        #
+        def get(arguments={})
+          raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]
+
+          valid_params = [
+            :local,
+            :ignore_unavailable,
+            :allow_no_indices,
+            :expand_wildcards ]
+
+          method = 'GET'
+
+          path   = Utils.__pathify Utils.__listify(arguments[:index]), Utils.__listify(arguments.delete(:feature))
+
+          params = Utils.__validate_and_extract_params arguments, valid_params
+          body = nil
+
+          perform_request(method, path, params, body).body
+        end
+      end
+    end
+  end
+end

elasticsearch-api/test/unit/indices/get_test.rb

@@ -0,0 +1,45 @@
+require 'test_helper'
+
+module Elasticsearch
+  module Test
+    class IndicesGetTest < ::Test::Unit::TestCase
+
+      context "Indices: Get" do
+        subject { FakeClient.new }
+
+        should "perform correct request" do
+          subject.expects(:perform_request).with do |method, url, params, body|
+            assert_equal 'GET', method
+            assert_equal 'foo', url
+            assert_equal Hash.new, params
+            assert_nil   body
+            true
+          end.returns(FakeResponse.new)
+
+          subject.indices.get :index => 'foo'
+        end
+
+        should "pass the URL parameters" do
+          subject.expects(:perform_request).with do |method, url, params, body|
+            assert_equal 'foo', url
+            assert_equal 1, params[:ignore_unavailable]
+            true
+          end.returns(FakeResponse.new)
+
+          subject.indices.get :index => 'foo', :ignore_unavailable => 1
+        end
+
+        should "encode features in URL" do
+          subject.expects(:perform_request).with do |method, url, params, body|
+            assert_equal 'foo/_settings', url
+            true
+          end.returns(FakeResponse.new)
+
+          subject.indices.get :index => 'foo', :feature => '_settings'
+        end
+
+      end
+
+    end
+  end
+end