[TEST] Force flush even if not needed to ensure successful shards is greater than 0

src/main/java/org/elasticsearch/action/admin/indices/flush/FlushRequestBuilder.java

@@ -38,6 +38,11 @@ public class FlushRequestBuilder extends BroadcastOperationRequestBuilder<FlushR
         return this;
     }
 
+    public FlushRequestBuilder setForce(boolean force) {
+        request.force(force);
+        return this;
+    }
+
     @Override
     protected void doExecute(ActionListener<FlushResponse> listener) {
         ((IndicesAdminClient) client).flush(request, listener);

src/test/java/org/elasticsearch/get/GetActionTests.java

@@ -851,7 +851,7 @@ public class GetActionTests extends ElasticsearchIntegrationTest {
         assertThat(getResponse.getField(field).getValues().get(0).toString(), equalTo("value1"));
         assertThat(getResponse.getField(field).getValues().get(1).toString(), equalTo("value2"));
 
-        FlushResponse flushResponse = client().admin().indices().prepareFlush("my-index").get();
+        FlushResponse flushResponse = client().admin().indices().prepareFlush("my-index").setForce(true).get();
         // the flush must at least succeed on one shard and not all shards, because we don't wait for yellow/green
         assertThat(flushResponse.getSuccessfulShards(), greaterThanOrEqualTo(1));