Using custom ingest pipeline for AWS integration

Hi there,
Im fairly new to Elastic/Kibana, please bear with me.

We use Elastic v7.17. I've setup an AWS Cloudwatch integration to collect logs from a custom app which logs to Cloudwatch. The log is unstructured, so I have also created an ingest pipeline to parse the relevant fields.

Question - How do I use/configure the integration to use this pipeline? Also, how can I specify a new index to use for these custom logs?