Adding test to verify behavior when a 429 status is returned from ES.

zipkin-storage/elasticsearch/src/test/java/zipkin2/elasticsearch/internal/HttpBulkIndexerTest.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2015-2019 The OpenZipkin Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package zipkin2.elasticsearch.internal;
+
+import java.io.IOException;
+import java.util.concurrent.RejectedExecutionException;
+import okio.Buffer;
+import okio.ByteString;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import zipkin2.elasticsearch.internal.HttpBulkIndexer.CheckForErrors;
+
+public class HttpBulkIndexerTest {
+  @Rule public ExpectedException expectedException = ExpectedException.none();
+
+  @Test
+  public void throwRejectedExecutionExceptionWhenOverCapacity() throws IOException {
+    Buffer response = new Buffer().write(ByteString.encodeUtf8("{\"took\":0,\"errors\":true,\"items\":[{\"index\":{\"_index\":\"dev-zipkin:span-2019.04.18\",\"_type\":\"span\",\"_id\":\"2511\",\"status\":429,\"error\":{\"type\":\"es_rejected_execution_exception\",\"reason\":\"rejected execution of org.elasticsearch.transport.TransportService$7@7ec1ea93 on EsThreadPoolExecutor[bulk, queue capacity = 200, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@621571ba[Running, pool size = 4, active threads = 4, queued tasks = 200, completed tasks = 3838534]]\"}}}]}"));
+
+    expectedException.expect(RejectedExecutionException.class);
+    CheckForErrors.INSTANCE.convert(response);
+  }
+}