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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