[API] Ensure that the :index param is supported for cat.segments

Author: estolfo

elasticsearch-api/lib/elasticsearch/api/actions/cat/segments.rb

@@ -48,6 +48,7 @@ def segments(arguments={})
         #
         # @since 6.1.1
         ParamsRegistry.register(:segments, [
+            :index,
             :format,
             :bytes,
             :h,

elasticsearch-api/spec/elasticsearch/api/actions/cat/segments_spec.rb

@@ -23,13 +23,29 @@
     [
         'GET',
         '_cat/segments',
-        {},
+        params,
         nil,
         nil
     ]
   end
 
+  let(:params) do
+    {}
+  end
+
   it 'performs the request' do
     expect(client_double.cat.segments).to eq({})
   end
+
+  context 'when index is specified' do
+
+
+    let(:params) do
+      { index: 'foo' }
+    end
+
+    it 'performs the request' do
+      expect(client_double.cat.segments(index: 'foo')).to eq({})
+    end
+  end
 end