[GitHub] kamal-brill opened a new issue #3382: What's purpose of ackId when publishing to a topic ?

[GitBox <gi...@apache.org>]

kamal-brill opened a new issue #3382: What's purpose of ackId when publishing to a topic ? 
URL: https://github.com/apache/pulsar/issues/3382
 
 
   **Describe the bug**
   When we publish the message to a topic, it returns an `ackId`. What's the purpose of that `ackId` ? Can we use it to retrieve the particular message using any REST or WebSocket API ?
   
   **To Reproduce**
   Steps to reproduce the behavior:
   1. Go to WebSocket API Documentation page.
   2. Run the Node.js Producer and Reader examples.
   3. Send message from producer, it returns an unique "ackId" for each message that's published.
   
   **Expected behavior**
   There should be an REST API or WebSocket API available for retrieving the message and it's metadata.
   
   **Desktop (please complete the following information):**
    - OS: Docker
   

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