Hello,
Thanks for reaching out.
It seems you're asking of the elasticsearch certificates. You can get the certificates in the path
/etc/elasticsearch/certs, while the Wazuh indexer certificates can be found in the path
/etc/wazuh-indexer/certs, then you can use the below documentation as guide to perform the integration:
I'd also like to point out that the above issue you encountered is because you were supposed to copy the root certificate of elasticsearch to the path /etc/logstash/elasticsearch-certs,
but it seems you have not done so.
I hope this helps. If you have further inqueries, do not hesitate to ask.
Best regards.