When viewing a pull request, you are able to see JIRA issues associated with the commit(s) that makes up the pull request. The application property plugin.jira-integration.pullrequest.attribute.commits.max configures the number of commits in a pull request that are indexed when searching for JIRA issues to link to a particular pull request. Increasing this allows for more than the default of 100 commits to be indexed. This will allow the pull request to show all of the issues associated with its commits (up to the maximum of 1000 that can be indexed).

When viewing a JIRA issue, in the Development Summary panel, you are able to see the commits, branches and pull requests associated with the issue. For a branch, or within a pull request, there is a limit of 100 commits that are indexed when searching for the JIRA issue, and this limit is not configurable. To be consistent with plugin.jira-integration.pullrequest.attribute.commits.max, and to be able to get around this, there should be a way to configure the limit to beyond 100 commits.