Multiple Sum subaggregations at same level using Java API

Elastic Stack Elasticsearch
1

Any way to add the subaggregations to my query? I'm trying to clean up my code. Here's what it looks like now.

builder.setQuery(query)
   .addAggregation(AggregationBuilders.terms("group_by_this_field").field("this_field")
		  .subAggregation(AggregationBuilders.terms("group_by_that_field")
											 .field("that_field")
											 .subAggregation(AggregationBuilders
													 .sum("field_1")
													 .field("field_1"))
											 .subAggregation(AggregationBuilders
													 .sum("field_2")
													 .field("field_2"))
											 .subAggregation(AggregationBuilders
													 .sum("field_3")
													 .field("field_3")).subAggregation(AggregationBuilders
														 .topHits("agg_source")
														 .fetchSource(aggSource, new String[0])))));
2

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