[8.x](backport #41358) x-pack/filebeat/input/{cel,httpjson}: fix flaky test #41406
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Do not use uncontrolled randomisation in tests where it is not necessary. The retry tests in the httpjson and cel packages were using a randomised 5xx HTTP status code to trigger the retry behaviour of the the go-retryablehttp package. This has the unfortunate consequence of causing 2% of test runs to fail. The reason for this is given in the go-retryablehttp documentation[1]: Mainly, if an error is returned by the client (connection errors, etc.), or if a 500-range response code is received (except 501), then a retry is invoked after a wait period. Since the package is already tested, and is documented to accept all 5xx status codes except 501 to cause a retry, just use 500. [1]https://pkg.go.dev/github.com/hashicorp/[email protected]#section-readme (cherry picked from commit 794b832)
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Proposed commit message
Do not use uncontrolled randomisation in tests where it is not necessary. The retry tests in the httpjson and cel packages were using a randomised 5xx HTTP status code to trigger the retry behaviour of the the go-retryablehttp package. This had the unfortunate consequence of causing 2% of test runs to fail.
The reason for this is given in the go-retryablehttp documentation[1]:
Since the package is already tested, and is documented to accept all 5xx status codes except 501 to cause a retry, just use 500.
[1]https://pkg.go.dev/github.com/hashicorp/[email protected]#section-readme
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This is an automatic backport of pull request #41358 done by [Mergify](https://mergify.com).