This must be done after SERVER-37643 moves all index builds behind the index builds interface to run asynchronously on a Threadpool.
Startup should recover and restart index builds that were in-progress on shutdown, but not wait for their completion or the result (failure/success).
- has to be done after
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                    SERVER-37643 add createIndexes command logic to the index build interface -         
- Closed
 
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- is related to
- 
                    SERVER-38702 Set up FCV for simultaneous index builds -         
- Closed
 
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                    SERVER-39086 Move startup recovery index creation logic into IndexBuildsCoordinator -         
- Closed
 
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- related to
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                    SERVER-38118 Write characterization tests for restarted nodes in standalone with unfinished indexes -         
- Closed
 
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- 
                    SERVER-38910 Remove redundant rollback handling on index drops -         
- Closed
 
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