#135 Remove invalid function call to indexof

[dylanjustice]

135 Remove invalid function call to indexof and replace with object notation

Still not really thrilled with this design, and I may look at a new module using the jenkins cli when the typescript port is complete. But this will work for us in the short term.

• [x] Related GitHub issue(s) linked in PR description
• [x] Destination branch merged, built and tested with your changes
• [x] Code formatted and follows best practices and patterns
• [x] Code builds cleanly (no additional warnings or errors)
• [x] Manually tested
• [x] Automated tests are passing
• [x] No decreases in automated test coverage
• [/] Documentation updated (readme, docs, comments, etc.)
• [x ] Localization: No hard-coded error messages in code files (minimally in string constants)

[brandongregoryscott]

Thanks for cleaning this up, @dylanjustice!