wu-sheng opened a new pull request #4364: Support Downsampling Data Packing feature in ES storage implementation URL: https://github.com/apache/skywalking/pull/4364 ### Downsampling Data Packing Downsampling data packing(`storage/elasticsearch/enablePackedDownsampling`, default activated) is a new feature since 7.0.0. Metrics data has 4 different precisions, based on `core/default/downsampling` configurations. In previous(6.x), every precision of each metrics had one separated index. After this is activated, metrics of day and hour precisions are merged into minute precision. The number of indexes decreased, and cause less payload to the ElasticSearch server. ### The new data format preview  After enabling this feature, 3 precisions of metrics data are all existing in one index(minute precision). ### Why query could keep in the same. From my understanding, once query could use the right name(merged index name), as they are using different timestamp format(because of precision, length is different), they will exclude other precision data automatically. So no change is required. ____ To all @apache/skywalking-committers This PR has a small(18 files only) change set, but influenced scope is large. And this doesn't have the side-effect, so I active it by default. Please review and give me some feedback.
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