Add SSL support and update clients

[edmocosta]

Release notes

• Updated Enterprise Search clients to version >= 7.16, < 9, adding also support to the following SSL configurations: ssl_certificate_authorities, ssl_truststore_path, ssl_truststore_password, ssl_truststore_type, ssl_verification_mode, ssl_supported_protocols and ssl_cipher_suites.
• [BREAKING] Swiftype endpoints are no longer supported for both plugins App Search and Workplace Search. The App Search deprecated options host and path were removed.
• Fixed the sprintf format support for the Workplace Search source configuration

What does this PR do?

Why is it important/What is the impact to the user?

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files (and/or docker env variables)
• I have added tests that prove my fix is effective or that my feature works

Related issues

• Closes Logstash - Plugins - SSL Settings Standardization - Add SSL support to Elastic app/workplace search plugins elastic/logstash#15114

[andsel]

The general PR seems good, but there a couple of points that need clarification, plus a couple of syntax related things.

[andsel]

LGTM

[edmocosta]

All the latest changes seems to be working fine! Thanks for your help, @andsel! ✅

[andsel]

Hi @yaauie, thank's a lot for your review. I've integrated your suggestion and the PR is ready for a second round of review 🙏