indexing search results error in SSC post 18.10 migration

We have just migrated from 17.10 to 18.10 and I get the following error message upon logging into SSC. Index Error 18.10.JPG

Has anyone else encountered this error? It's not a "Hard Down" as functionality still continues with SSC. Just wondering what that error means and what can be done about it.

Thanks in advance,

Kahn

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