Add TRACE, CONNECT, and PATCH http methods (#31035)

This is related to #31017. That issue identified that these three http
methods were treated like GET requests. This commit adds them to
RestRequest. This means that these methods will be handled properly and
generate 405s.

modules/transport-netty4/src/main/java/org/elasticsearch/http/netty4/Netty4HttpRequest.java

@@ -119,7 +119,19 @@ public class Netty4HttpRequest extends RestRequest {
             return Method.OPTIONS;
         }
 
-        return Method.GET;
+        if (httpMethod == HttpMethod.PATCH) {
+            return Method.PATCH;
+        }
+
+        if (httpMethod == HttpMethod.TRACE) {
+            return Method.TRACE;
+        }
+
+        if (httpMethod == HttpMethod.CONNECT) {
+            return Method.CONNECT;
+        }
+
+        throw new IllegalArgumentException("Unexpected http method: " + httpMethod);
     }
 
     @Override

plugins/transport-nio/src/main/java/org/elasticsearch/http/nio/NioHttpRequest.java

@@ -84,7 +84,19 @@ public class NioHttpRequest extends RestRequest {
             return Method.OPTIONS;
         }
 
-        return Method.GET;
+        if (httpMethod == HttpMethod.PATCH) {
+            return Method.PATCH;
+        }
+
+        if (httpMethod == HttpMethod.TRACE) {
+            return Method.TRACE;
+        }
+
+        if (httpMethod == HttpMethod.CONNECT) {
+            return Method.CONNECT;
+        }
+
+        throw new IllegalArgumentException("Unexpected http method: " + httpMethod);
     }
 
     @Override

server/src/main/java/org/elasticsearch/rest/RestRequest.java

@@ -130,7 +130,7 @@ public abstract class RestRequest implements ToXContent.Params {
     }
 
     public enum Method {
-        GET, POST, PUT, DELETE, OPTIONS, HEAD
+        GET, POST, PUT, DELETE, OPTIONS, HEAD, PATCH, TRACE, CONNECT
     }
 
     public abstract Method method();