While you monitor the indexer processing status through the REST calls, you realize that the indexer has failed with status persitentFailure. After fixing the issue, which REST call would you make to restart the scheduled execution? (select one answer choice)

Answer options:

A.GET https://[service name].search.windows.net/indexers/[indexer name]/status?api-version=2020-06-30
B.PUT https://[service name].search.windows.net/indexers/[indexer name]?api-version=2020-06-30
C.POST https://[service name].search.windows.net/indexers/[indexer name]/reset?api-version=2020-06-30
D.POST https://[service name].search.windows.net/indexers?api-version=2020-06-30

Correct Answer: C
Option A is incorrect because it is used to get status of the indexer.
Option B is incorrect because it is used to update the indexer definition of an existing indexer.
Option C is correct. A persitent failure requires human intervention. After the issue is remediated, the indexer needs to be reset in order to start the scheduled execution.
Option D is incorrect because this command is used to create a new indexer. However, in this scenario the indexer is already created.
Reference:
To learn more about how to monitor indexer status, use the link given below: 

https://docs.microsoft.com/en-us/azure/search/search-howto-monitor-indexers