Add support for require_alias parameter to high level rest client (#67865)

The main changes are:
* Set the require_alias parameter in the reindex, index and update methods in RequestConverters class.
* Test that the parameter can be parsed correctly.

Closes #67819.

client/rest-high-level/src/main/java/org/elasticsearch/client/RequestConverters.java

@@ -321,6 +321,7 @@ final class RequestConverters {
         parameters.withPipeline(indexRequest.getPipeline());
         parameters.withRefreshPolicy(indexRequest.getRefreshPolicy());
         parameters.withWaitForActiveShards(indexRequest.waitForActiveShards());
+        parameters.withRequireAlias(indexRequest.isRequireAlias());
 
         BytesRef source = indexRequest.source().toBytesRef();
         ContentType contentType = createContentType(indexRequest.getContentType());
@@ -347,6 +348,7 @@ final class RequestConverters {
         parameters.withRetryOnConflict(updateRequest.retryOnConflict());
         parameters.withVersion(updateRequest.version());
         parameters.withVersionType(updateRequest.versionType());
+        parameters.withRequireAlias(updateRequest.isRequireAlias());
 
         // The Java API allows update requests with different content types
         // set for the partial document and the upsert document. This client
@@ -568,7 +570,8 @@ final class RequestConverters {
             .withTimeout(reindexRequest.getTimeout())
             .withWaitForActiveShards(reindexRequest.getWaitForActiveShards())
             .withRequestsPerSecond(reindexRequest.getRequestsPerSecond())
-            .withSlices(reindexRequest.getSlices());
+            .withSlices(reindexRequest.getSlices())
+            .withRequireAlias(reindexRequest.getDestination().isRequireAlias());
 
         if (reindexRequest.getScrollTime() != null) {
             params.putParam("scroll", reindexRequest.getScrollTime());
@@ -1003,6 +1006,13 @@ final class RequestConverters {
             return this;
         }
 
+        Params withRequireAlias(boolean requireAlias) {
+            if (requireAlias) {
+                return putParam("require_alias", Boolean.toString(requireAlias));
+            }
+            return this;
+        }
+
         Params withIndicesOptions(IndicesOptions indicesOptions) {
             if (indicesOptions != null) {
                 withIgnoreUnavailable(indicesOptions.ignoreUnavailable());

client/rest-high-level/src/test/java/org/elasticsearch/client/CrudIT.java

@@ -539,6 +539,19 @@ public class CrudIT extends ESRestHighLevelClientTestCase {
             assertEquals("Elasticsearch exception [type=version_conflict_engine_exception, reason=[with_create_op_type]: " +
                          "version conflict, document already exists (current version [1])]", exception.getMessage());
         }
+        {
+            ElasticsearchStatusException exception = expectThrows(ElasticsearchStatusException.class, () -> {
+                IndexRequest indexRequest = new IndexRequest("index").id("require_alias");
+                indexRequest.source(XContentBuilder.builder(xContentType.xContent()).startObject().field("field", "test").endObject());
+                indexRequest.setRequireAlias(true);
+
+                execute(indexRequest, highLevelClient()::index, highLevelClient()::indexAsync);
+            });
+
+            assertEquals(RestStatus.NOT_FOUND, exception.status());
+            assertEquals("Elasticsearch exception [type=index_not_found_exception, reason=no such index [index] and [require_alias]" +
+                " request flag is [true] and [index] is not an alias]", exception.getMessage());
+        }
     }
 
     public void testUpdate() throws IOException {
@@ -717,6 +730,17 @@ public class CrudIT extends ESRestHighLevelClientTestCase {
             assertEquals("Update request cannot have different content types for doc [JSON] and upsert [YAML] documents",
                     exception.getMessage());
         }
+        {
+            ElasticsearchStatusException exception = expectThrows(ElasticsearchStatusException.class, () -> {
+                UpdateRequest updateRequest = new UpdateRequest("index", "id");
+                updateRequest.setRequireAlias(true);
+                updateRequest.doc(new IndexRequest().source(Collections.singletonMap("field", "doc"), XContentType.JSON));
+                execute(updateRequest, highLevelClient()::update, highLevelClient()::updateAsync);
+            });
+            assertEquals(RestStatus.NOT_FOUND, exception.status());
+            assertEquals("Elasticsearch exception [type=index_not_found_exception, reason=no such index [index] and [require_alias]" +
+                " request flag is [true] and [index] is not an alias]", exception.getMessage());
+        }
     }
 
     public void testBulk() throws IOException {

client/rest-high-level/src/test/java/org/elasticsearch/client/ReindexIT.java

@@ -8,6 +8,7 @@
 
 package org.elasticsearch.client;
 
+import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse;
 import org.elasticsearch.action.bulk.BulkItemResponse;
@@ -86,6 +87,24 @@ public class ReindexIT extends ESRestHighLevelClientTestCase {
             assertEquals(0, bulkResponse.getBulkFailures().size());
             assertEquals(0, bulkResponse.getSearchFailures().size());
         }
+        {
+            // set require_alias to true but the destination index is not an alias
+            ReindexRequest reindexRequest = new ReindexRequest();
+            reindexRequest.setSourceIndices(sourceIndex);
+            reindexRequest.setDestIndex(destinationIndex);
+            reindexRequest.setSourceQuery(new IdsQueryBuilder().addIds("1"));
+            reindexRequest.setRefresh(true);
+            reindexRequest.setRequireAlias(true);
+
+            ElasticsearchStatusException exception = expectThrows(ElasticsearchStatusException.class, () -> {
+                execute(reindexRequest, highLevelClient()::reindex, highLevelClient()::reindexAsync);
+            });
+
+            assertEquals(RestStatus.NOT_FOUND, exception.status());
+            assertEquals("Elasticsearch exception [type=index_not_found_exception, reason=no such index [" +
+                destinationIndex + "] and [require_alias] request flag is [true] and [" +
+                destinationIndex + "] is not an alias]", exception.getMessage());
+        }
     }
 
     public void testReindexTask() throws Exception {

client/rest-high-level/src/test/java/org/elasticsearch/client/RequestConvertersTests.java

@@ -437,6 +437,10 @@ public class RequestConvertersTests extends ESTestCase {
         } else {
             expectedParams.put("slices", "1");
         }
+        if (randomBoolean()) {
+            reindexRequest.setRequireAlias(true);
+            expectedParams.put("require_alias", "true");
+        }
         setRandomTimeout(reindexRequest::setTimeout, ReplicationRequest.DEFAULT_TIMEOUT, expectedParams);
         setRandomWaitForActiveShards(reindexRequest::setWaitForActiveShards, ActiveShardCount.DEFAULT, expectedParams);
         expectedParams.put("scroll", reindexRequest.getScrollTime().getStringRep());
@@ -657,6 +661,11 @@ public class RequestConvertersTests extends ESTestCase {
             }
         }
 
+        if (randomBoolean()) {
+            indexRequest.setRequireAlias(true);
+            expectedParams.put("require_alias", "true");
+        }
+
         XContentType xContentType = randomFrom(XContentType.values());
         int nbFields = randomIntBetween(0, 10);
         try (XContentBuilder builder = XContentBuilder.builder(xContentType.xContent())) {
@@ -746,6 +755,11 @@ public class RequestConvertersTests extends ESTestCase {
             randomizeFetchSourceContextParams(updateRequest::fetchSource, expectedParams);
         }
 
+        if (randomBoolean()) {
+            updateRequest.setRequireAlias(true);
+            expectedParams.put("require_alias", "true");
+        }
+
         Request request = RequestConverters.update(updateRequest);
         assertEquals("/" + index + "/_update/" + id, request.getEndpoint());
         assertEquals(expectedParams, request.getParameters());