Using legacy setup after upgrading Elasticsearch to 8.X

My current self-managed setup on v7.9.2 (all parts) looks like this:
Custom APM agents (hundreds) --> load balancer --> APM servers --> Kafka for MQ --> Logstash servers --> Elasticsearch servers

I upgraded a development stack to 8.6.2. After a couple of hours I managed to get it working and saw that data is being indexed. However, I can't see new data in the 'APM' menu. After a while, I checked and saw that the mapping is wrong (not applied). Per the documentation, I installed the integration. I'm not sure how can I set the mapping up on a 8.X stack, I don't think copying the old template would be sufficient. Could someone help with this issue?


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