I have an application that is using SOLR on a mounted file system.  However,
machine or human error can sometimes unmount the file system.  This causes
Solr to write index files to a different area from the index I am using.

This also means that the index instance becomes corrupt, because some
entries are in the (correct) index, and some are in the one that was created
because the mounted file system was missing.

Is there an option in Solr that says "Do not write to the index if the
directory path does not already exist"?  Or some other way of ensuring that
I don't get multiple index instances created unintentionally, in a situation
such as this?

Thanks!

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