[DISCUSS] Drop connectors for 5.x and restart the flink es source connector

Hi all: when i coding the es source connector here https://github.com/liuyongvs/flink/commit/c397a759d05956629a27bf850458dd4e70330189 for the elasticsearch source connector. The doc is here https://cwiki.apache.org/confluence/display/FLINK/FLIP-127%3A+Support+Elasticsearch+Source+Connector ,a

Re: [DISCUSS] Upgrade HBase connector to 2.2.x

+ 1 to support HBase 2.xand the hbase 2.x client dependencies are simple and clear. Tbe hbase project shades them all Jark Wu-3 wrote > +1 to support HBase 2.xBut not sure about dropping support for 1.4.xI > cc'ed to user@ and user-zh@ to hear more feedback from users.Best,JarkOn > Thu, 18 Jun 2020