Is your feature request related to a problem?

In https://github.com/opensearch-project/opensearch-sdk-java/blob/main/src/main/java/org/opensearch/sdk/sample/rest/RestHelloAction.java#L37 the developer has to implement a handleRequest that acts as a router that checks for methods, e.g.

if (Method.GET.equals(method) && "/hello".equals(uri)) {
            return new BytesRestResponse(OK, GREETING);
        }

This is unnecessarily verbose.

What solution would you like?

Provide a higher level implementation that implements ExtensionRestHandler . As a developer I would like to write something shorter:

public class RestHelloAction extends GenericExtensionRestHandler {

    @Override
    public List<Route> routes() {
        return singletonList(
            new RouteHandler(GET, "/hello", this.handleHello),
            new RouteHandler(GET, "/world", this.handleWorld)
        );
    }

    public RestResponse handleHello(...) {
    }

    public RestResponse handleWorld(...) {
    }
}

Alternatives?

There might be an HTTP handler library that provides routing out of the box that we could optionally plug in, e.g. https://github.com/undertow-io/undertow like so.