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Backwards Compatibility:
Fully Compatible
Sprint:
Storage NYC 2018-12-17, Storage NYC 2018-12-31, Storage NYC 2019-01-14, Execution Team 2019-09-09, Execution Team 2019-09-23

Add the following oplog commands:
startIndexBuild
commitIndexBuild
abortIndexBuild

initial sync must copy the in-prog index builds' info.

Rollback (via refetch and recover to stable) must handle the new oplog entries

The temporary TwoPhaseCreateIndexes command can be plugged in to test the functionality.

is depended on by

SERVER-38701 Prohibit new simultaneous index builds oplog entries in applyOps

SERVER-39239 Two-phase index builds on secondaries will wait for the commitIndexBuild oplog entry before committing.

is related to

SERVER-37645 Add parsing for new index build fields in index catalog entries

SERVER-37952 Restart index builds from persisted recovery points

SERVER-37979 Add writing utilities to the index build interface