Add http compression level

[kaisecheng]

This commit deprecated http_compression in favor of compression_level. http_compression false mapped to compression_level 0, and true mapped to 1. The default setting has changed from disabling compression to enabling compression at level 1 (best speed)

Fix: https://github.com/elastic/ingest-dev/issues/2217

[kaisecheng]

The unit tests fail with 8.10.0-SNAPSHOT BC5 in main branch. rspec passed all tests but the docker doesn't exit. The issue cannot reproduce locally

[strawgate]

Can we backport the compression changes to latest 7.x?

[kaisecheng]

@strawgate we won't pin the minor update in 7.17, but you can install it by bin/logstash-plugin update logstash-output-elasticsearch