Cherry-pick #15668 to 7.x: Support application default credentials (ADC) for Google Pub/Sub #17790
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Cherry-pick of PR #15668 to 7.x branch. Original message:
What does this PR do?
Update the Google Pub/Sub input to support reading Application Default Credentials
(ADC) in addition to the credentials_file and credentials_json config options.
If neither config option is set then it will attempt to search for the default credentials.
Generally this means reading the GOOGLE_APPLICATION_CREDENTIALS environment
variable plus searching a few other well known locations.
The googlecloud module was updates to support all three authentication mechanisms.
Why is it important?
Without this change, Filebeat requires a path to a file with credentials to be provided in its config and is unable to use for example a default service account.
Checklist
I have commented my code, particularly in hard-to-understand areasI have made corresponding changes to the documentationI have made corresponding change to the default configuration filesI have added tests that prove my fix is effective or that my feature worksAuthor's Checklist
How to test this PR locally
Related issues
Use cases
Sending logs to Elastic from PubSub queue
Screenshots
Logs