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elasticsearch - How do I pass Parent Aggregation key to Child Aggregation Painless Script in Elastic search DSL Query? - Stack Overflow
Elasticsearch aggregation query ignores parent filter when setting min_doc_count to 0 in child terms aggregation · Issue #40621 · elastic/ elasticsearch · GitHub
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Comprehensive Guide to Bucket Aggregations in Elasticsearch: Part I | by Kirill Goltsman | Qbox Search as a Service | Medium
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