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Is your end goal achieving exactly-once semantics? Or is your use case a lookup of a message in a topic?

Not sure to understand your question, but I think my goal is much more a lookup of message in a topic ie I don't want to send duplicate in a topic from the producer side.

Message deduplication can achieve this, conceptually it is only shifting the responsibility to the broker to ensure no message is persisted twice https://pulsar.apache.org/docs/3.1.x/cookbooks-deduplication/