Kafka topicPattern fails to match topics containing dots (.) in 32.0.0

In Druid 32.0.0, when using topicPattern to ingest from Kafka topics whose names contain dots (e.g., abc.context.topic-name1), the error No partitions found for topics that match given pattern occurs. Multiple pattern formats have been tried (with/without escaping dots, regex wildcards, alternations), all failing. Directly specifying full topic names in the topic field works fine. This appears to be a bug in pattern matching for topic names with special characters

Start by reproducing the Druid 32.0.0 topicPattern failure with Kafka topics containing dots, then compare it with direct topic-name ingestion. Verify matching behavior across the pattern formats described in the issue; done means dotted topic names are discovered without the “No partitions found” error.

Written by the indexing model from the issue text.