I saw that ticket and it appears that with the on demand version the toolkit should be installed and I should have access to a 'participant' field. I don't and when I try for 'Participant = currentuser()' I get an error: Field 'Participant' does not exist or you do not have permission to view it.
Not sure what I am doing wrong. Some of those comments are 5 years old from that ticket and realted tickets.
Solution is to install Script Runner plugin (https://marketplace.atlassian.com/plugins/com.onresolve.jira.groovy.groovyrunner/version/1017) and then use for searching issueFunction custom field.
Example from this page:
Find issues commented by jbloggs within the last 4 weeks:
issueFunction in commented("after -4w by jbloggs")
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