TestAppenderIndexFailedLogging is Flaky

[rubvs]

=== RUN   TestAppenderIndexFailedLogging
    appender_test.go:797:
        	Error Trace:	/Users/rubenvanstaden/elastic/go-docappender/appender_test.go:797
        	Error:      	"[{{error 2024-11-07 17:06:51.161592 -0500 EST m=+0.306465626  failed to index documents in 'an_index' (document_parsing_exception):  undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161538 -0500 EST m=+0.306411376  failed to index documents in 'an_index' (error_type): error_reason_even undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161601 -0500 EST m=+0.306474751  failed to index documents in 'an_index' (error_type): error_reason_even undefined } [{documents 11 2  <nil>}]} {{error 2024-11-07 17:06:51.161568 -0500 EST m=+0.306440959  failed to index documents in 'an_index' (error_type): error_reason_odd undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161612 -0500 EST m=+0.306485709  failed to index documents in 'an_index' (error_type): error_reason_odd undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161576 -0500 EST m=+0.306449709  failed to index documents in 'an_index' (unavailable_shards_exception):  undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161621 -0500 EST m=+0.306494751  failed to index documents in 'an_index' (unavailable_shards_exception):  undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161579 -0500 EST m=+0.306452168  failed to index documents in 'an_index' (x_content_parse_exception):  undefined } [{documents 11 1  <nil>}]} {{error 2024-11-07 17:06:51.161585 -0500 EST m=+0.306458001  failed to index documents in 'an_index' (x_content_parse_exception):  undefined } [{documents 11 1  <nil>}]}]" should have 5 item(s), but has 9
        	Test:       	TestAppenderIndexFailedLogging
--- FAIL: TestAppenderIndexFailedLogging (0.00s)
FAIL
FAIL	github.com/elastic/go-docappender/v2	2.342s
FAIL

Test

• Race detector has to be enabled

go test -v -race ./..