August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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avg_bucket
The purpose of this is to compute the average value of the buckets from the aggregation in the previous stage:
- Example: The purpose is to compute the overall average close price in addition to the monthly close price for the ACWF ETF in the cf_etf_hist_price index. We can see that the overall_avg_close aggregation is a sibling to the monthly_avg_close aggregation:
"query":{"match": {"symbol":"ACWF"}},"aggs":{"monthly_avg_close": {"date_histogram":{"field": "date","interval": "month","format": "yyyy-MM-dd"}, "aggs":{"avg_close_on_month":{"avg":{"field":"close"}}}},"overall_avg_close":{"avg_bucket":{"buckets_path":"monthly_avg_close>avg_close_on_month"}}}
- Resulting buckets: The avg_close_on_month field shows the monthly average ...
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