Fix build-index m3 metrics
Fix build-index m3 metrics

Summary: Just realized that build-index is missing m3 config so metrics wont show up...

Test Plan:
make test
make integration

Reviewers: #kraken, codyg

Reviewed By: #kraken, codyg

Subscribers: jenkins

Differential Revision: https://code.uberinternal.com/D1777401

uber/kraken,uber/kraken,uber/kraken,uber/kraken,uber/kraken