peng-yongsheng commented on issue #2039: [OAP Server][Storage] A new Elasticsearch client supports 2.x, 5.x and 6.x version families. URL: https://github.com/apache/incubator-skywalking/issues/2039#issuecomment-447210833 ### Step 1. Comparison of the differences from the request and response of the Elasticsearch API. 1. Design the Elasticsearch client API. 1. Develop and test. ### Which API our project used now. 1. Indices APIs: Create, Delete, Exists 1. Document APIs: Index, Get, Delete, Delete by query, Update, Bulk 1. Search APIs: Query, From/Size, Count 1. Metrics Aggregations: Avg, Max, Min, Sum Elasticsearch have so many version. So, we can't comparison all of them one by one. First of all, we just comparison the differences from the last release of the 2.x, 5.x, 6.x.
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