The search near the top right corner of Jira Software cloud does not search for text in the comment and work log sections of issue.
In the Work log section I indicate a ship track number of a package. When I search for this ship track number in the search field, it does not return any result.
I was able to validate your use case:
Digging into the docs, I was able to find two reasons why this doesn't work:
The JQL that I used for the latter bullet point above...
worklogComment ~ "2468013579"
...results in "No issues found", despite a Worklog Entry containing that value.
My conclusion is that Worklog Entry Comment text is not searchable in Jira Cloud.
Two workarounds for you to go with instead:
Hope that helps!
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