Revert "Change operation id from integer to string representation"

This reverts commit a07e0252f995700e67dcbb37b9ad5a301b8ac69a.

Reason for revert: Breaks build

Exempt-From-Owner-Approval: revert to fix build breakage

Change-Id: Ice06ab93dc2836c69aeef68558dc07a6a25593ec
1 file changed