Add toString() implementation for UpdateRequest (#27997)

server/src/main/java/org/elasticsearch/action/update/UpdateRequest.java

@@ -19,6 +19,7 @@
 
 package org.elasticsearch.action.update;
 
+import java.util.Arrays;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.DocWriteRequest;
 import org.elasticsearch.action.index.IndexRequest;
@@ -893,4 +894,28 @@ public class UpdateRequest extends InstanceShardOperationRequest<UpdateRequest>
         builder.endObject();
         return builder;
     }
+
+    @Override
+    public String toString() {
+        StringBuilder res = new StringBuilder()
+            .append("update {[").append(index)
+            .append("][").append(type)
+            .append("][").append(id).append("]");
+        res.append(", doc_as_upsert[").append(docAsUpsert).append("]");
+        if (doc != null) {
+            res.append(", doc[").append(doc).append("]");
+        }
+        if (script != null) {
+            res.append(", script[").append(script).append("]");
+        }
+        if (upsertRequest != null) {
+            res.append(", upsert[").append(upsertRequest).append("]");
+        }
+        res.append(", scripted_upsert[").append(scriptedUpsert).append("]");
+        res.append(", detect_noop[").append(detectNoop).append("]");
+        if (fields != null) {
+            res.append(", fields[").append(Arrays.toString(fields)).append("]");
+        }
+        return res.append("}").toString();
+    }
 }

server/src/test/java/org/elasticsearch/action/update/UpdateRequestTests.java

@@ -639,4 +639,16 @@ public class UpdateRequestTests extends ESTestCase {
         assertThat(result.action(), instanceOf(UpdateResponse.class));
         assertThat(result.getResponseResult(), equalTo(DocWriteResponse.Result.NOOP));
     }
+
+    public void testToString() throws IOException {
+        UpdateRequest request = new UpdateRequest("test", "type1", "1")
+            .script(mockInlineScript("ctx._source.body = \"foo\""));
+        assertThat(request.toString(), equalTo("update {[test][type1][1], doc_as_upsert[false], "
+            + "script[Script{type=inline, lang='mock', idOrCode='ctx._source.body = \"foo\"', options={}, params={}}], "
+            + "scripted_upsert[false], detect_noop[true]}"));
+        request = new UpdateRequest("test", "type1", "1").fromXContent(
+            createParser(JsonXContent.jsonXContent, new BytesArray("{\"doc\": {\"body\": \"bar\"}}")));
+        assertThat(request.toString(), equalTo("update {[test][type1][1], doc_as_upsert[false], "
+            + "doc[index {[null][null][null], source[{\"body\":\"bar\"}]}], scripted_upsert[false], detect_noop[true]}"));
+    }
 }