Server 2012 Indexing Service

This server hosts a document management system based on SQL, but also has a large directory of documents.  The program offers full text indexing of the documents using the server's indexing service.  There are currently just over 1 million documents included in that index.  We have started having issues with the index developing corruption, at which point the server detects it and starts a reindex.  With the number of documents that indexing takes several days.  The directory with the catalog (in ProgramData) is excluded from backup and from antivirus scanning.  I can't find any definitive reason for the corruption.  I also can't find any definitive advice on the recommended size or number of documents for the service to work well.  Does anyone have experience using the index service for very large numbers of documents?  Does it work well?  Are there any reasons for the corruption that I might be overlooking?  Thanks!
landiiiks2Asked:
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