Fix remnants

Author: pawankartik-elastic

qa/smoke-test-http/src/internalClusterTest/java/org/elasticsearch/http/FieldCapabilitiesIT.java

@@ -21,7 +21,10 @@ public class FieldCapabilitiesIT extends HttpSmokeTestCase {
     public void testProjectRoutingInNonCrossProjectEnv() {
         // With project_routing as query param in non-CPS env
         {
-            Request request = new Request("POST", "_field_caps?fields=*&project_routing=_alias:_origin");
+            Request request = new Request("POST", "_field_caps?fields=*");
+            request.setJsonEntity("""
+                { "project_routing": "_alias:_origin" }
+                """);
             ResponseException error = expectThrows(ResponseException.class, () -> getRestClient().performRequest(request));
             assertThat(error.getMessage(), containsString("request [_field_caps] contains unrecognized parameter: [project_routing]"));
             assertThat(error.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));

qa/smoke-test-http/src/internalClusterTest/java/org/elasticsearch/http/PointInTimeIT.java

@@ -48,7 +48,11 @@ public void testMissingRequiredParameters() {
     public void testProjectRoutingInNonCrossProjectEnv() {
         // With project_routing as query param in non-CPS env
         {
-            Request request = new Request("POST", "_pit?project_routing=_alias:_origin");
+            Request request = new Request("POST", "_pit");
+            request.setJsonEntity("""
+                { "project_routing": "_alias:_origin" }
+                """);
+
             request.addParameter("keep_alive", "1m");
             ResponseException error = expectThrows(ResponseException.class, () -> getRestClient().performRequest(request));
             assertThat(error.getMessage(), containsString("request [_pit] contains unrecognized parameter: [project_routing]"));