AbelSara opened a new issue #1382: support `consumer.setAckIndex()`
URL: https://github.com/apache/rocketmq/issues/1382
 
 
   1. Please describe the feature you are requesting.
   I want a feature that I can control number of messages which should be sent 
back.
   2. Provide any additional detail on your proposed use case for this feature.
   When consumer pull a batch of messages and one of them throw an exception, 
`consumeMessage` method will return `RECONSUME_LATER` and set `ackIndex` by 
`consumer.setAckIndex()`. `ConsumeMessageCurrentlyService` will receive this 
status and `ackIndex` property and send back messages which have not been 
consumed.
   3. Indicate the importance of this issue to you (blocker, must-have, 
should-have, nice-to-have). Are you currently using any workarounds to address 
this issue?
   should-have.
   
   

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