Does the health endpoint returns yellow/red if there is bad or missing index?

I have been reading about when the cluster health check returns yellow or red.
We use elasticsearch in our application. One of our customers keep seeing issues with our application search e.g. the search result is missing an item that they expect to see.
They are looking for a proactive way to find out whether their search indexes is up-to-date and if not do a full re-index to make sure the data that their users see is intact.
I am not sure if the health endpoint will actually return yellow or red if there is a missing index?

Thank you!

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