Spring Elasticsearch Aggregation Filtering Not Working - spring

Question

I'm trying to query pricing stats on products I am recording in my Elasticsearch Database by product number. The pricing may be for new, used or refurbished products, so I wish to filter on condition. The condition filter works as a JSON query in Marvel returning stats based on two price documents with condition new.
When I try to do similar using the Java API, I am getting stats based on 4 documents that includes 2 new and 2 refurbished.
Could anyone please identify what I am doing wrong in the Java code below?
Thanks.
Here's the working JSON Query:
GET /stats/price/_search
{
"query": {
"match_phrase": {"mpc": "MGTX2LL/A"}
},
"size": 0,
"aggs" : {
"low_price_stats" : {
"filter": {
"term" : { "condition" : "new"}
},
"aggs" : {
"price_stats" : { "extended_stats" : { "field" : "price" } }
}
}
}
}
And the problematic Java:
public Aggregations aggByManufacturerPartNumber(String mpn) {
SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withIndices("stats")
.withTypes("price")
.withQuery(termQuery("mpn", mpn))
.withFilter(
FilterBuilders.termFilter("condition", "New")
)
.addAggregation(AggregationBuilders.extendedStats("stats_agg").field("price"))
.build();
Aggregations aggregations = elasticsearchTemplate.query(searchQuery, new ResultsExtractor<Aggregations>() {
#Override
public Aggregations extract(SearchResponse response) {
return response.getAggregations();
}
});
return aggregations;
}

Answer 1

In your Java code you're only building the price_stats sub-aggregation without its parent filter aggregation. The call to withFilter will create a filter at the query level, not at the aggregation level. The correct Java code that matches your JSON query would be like this:
// build top-level filter aggregation
FilterAggregationBuilder lowPriceStatsAgg = AggregationBuilders.filter("low_price_stats")
.filter(FilterBuilders.termFilter("condition", "new"));
// build extended stats sub-aggregation
lowPriceStatsAgg.subAggregation(AggregationBuilders.extendedStats("stats_agg").field("price"));
// build query
SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withIndices("stats")
.withTypes("price")
.withQuery(termQuery("mpn", mpn))
.addAggregation(lowPriceStatsAgg)
.build();
// then get the results
Aggregations aggs = response.getAggregations();
Filter lowPriceStats = aggs.get("low_price_stats");
ExtendedStats statsAgg = lowPriceStats.get("stats_agg");
Besides, also note that in your JSON query you have a match_phrase on the mpc field while in your Java code you have a term query on the mpn field. So you probably need to fix that, too, but the above code fixes the aggregation part only.