Advanced Elasticsearch 7.0

composite

This allows us to create bucket pairs from different sources and perform paging quickly through large aggregation result sets in order:

• Example: The purpose is to perform aggregation to count documents for each pair of values from the family and rating fields—with ratings of 4 and 5—in the cf_etf index. We have limited ourselves to 5 results in the response:

"query": {"query_string": {"query": "rating:[4 TO 5]"}},"aggs": { "multi_sources": {"composite": {    "sources": [{"family": {"terms": {"field":"family"}}},{"rating": {"terms":                     {"field":"rating"}}}],"size":5}}}

• Resulting buckets: We can see that there are 5 results of the family and rating pairs. We can use the whole after_key expression inside the composite expression for the ...