Move dispatch methods to IElasticClient interface

Author: gmarz

src/Nest/IElasticClient.cs

@@ -1767,5 +1767,39 @@ Task<IExistsResponse> SearchExistsAsync<T>(Func<SearchExistsDescriptor<T>, Searc
 		ICatResponse<CatSegmentsRecord> CatSegments(ICatSegmentsRequest request);
 		Task<ICatResponse<CatSegmentsRecord>> CatSegmentsAsync(Func<CatSegmentsDescriptor, CatSegmentsDescriptor> selector = null);
 		Task<ICatResponse<CatSegmentsRecord>> CatSegmentsAsync(ICatSegmentsRequest request);
+
+		R Dispatch<D, Q, R>(
+			D descriptor
+			, Func<ElasticsearchPathInfo<Q>, D, ElasticsearchResponse<R>> dispatch
+			)
+			where Q : FluentRequestParameters<Q>, new()
+			where D : IRequest<Q>
+			where R : BaseResponse;
+
+		R Dispatch<D, Q, R>(
+			Func<D, D> selector
+			, Func<ElasticsearchPathInfo<Q>, D, ElasticsearchResponse<R>> dispatch
+			)
+			where Q : FluentRequestParameters<Q>, new()
+			where D : IRequest<Q>, new()
+			where R : BaseResponse;
+
+		Task<I> DispatchAsync<D, Q, R, I>(
+			D descriptor
+			, Func<ElasticsearchPathInfo<Q>, D, Task<ElasticsearchResponse<R>>> dispatch
+			)
+			where Q : FluentRequestParameters<Q>, new()
+			where D : IRequest<Q>
+			where R : BaseResponse, I
+			where I : IResponse;
+
+		Task<I> DispatchAsync<D, Q, R, I>(
+			Func<D, D> selector
+			, Func<ElasticsearchPathInfo<Q>, D, Task<ElasticsearchResponse<R>>> dispatch
+			)
+			where Q : FluentRequestParameters<Q>, new()
+			where D : IRequest<Q>, new()
+			where R : BaseResponse, I
+			where I : IResponse;
 	}
 }