Elasticsearch重要术语聚合：doc_count和bg_count的含义(Elasticsearch significant terms aggregation: meaning of doc_count and bg_count)

 我在查找文档时很难解释对重要术语聚合的响应中的doc_count和bg_count字段。 
 
 例如，我期望如果我不设置背景滤镜， bg_count应该是索引中文档的总数。 但是，我看到的是，每个结果的bg_count都不相同，并且它不在任何靠近文档总数的地方。 
 
 我假设doc_count是包含返回key.的文档的数量key. 
 
 这些价值的实际含义是什么？ 我在哪里可以找到更完整的文档？ 

I am having trouble finding documentation to explain the doc_count and bg_count fields in the response to the significant terms aggregation.
 
For example I would expect that, if I do not set a background filter, the bg_count should the the total number of documents in the index. However what I see is that the bg_count is not the same for each result, and it isn't anywhere near the total number of documents.
 
I assume that doc_count is the number of documents containing the returned key.
 
What is the actual meaning of these values? Where can I find more complete documentation for that? 

原文：https://stackoverflow.com/questions/49928871