PlanNode planNode = iterator.next();
assertThat(planNode, instanceOf(ESIndexNode.class));
ESIndexNode indexNode = (ESIndexNode) planNode;
Map<String, Object> values0 = XContentHelper.convertToMap(indexNode.sourceMaps().get(0), false).v2();
assertThat(indexNode.sourceMaps().size(), is(2));
assertThat(values0.size(), is(2));
Map<String, Object> values1 = XContentHelper.convertToMap(indexNode.sourceMaps().get(1), false).v2();
assertThat(values1.size(), is(2));