autowarmCount usefulness

[Erik Hatcher]

I'm trying to fully understand the LRUCache and the autowarmCount  
parameter.   Why does it make sense to auto-warm filters and query  
results?   In my case, if a new document is added it may invalidate  
many filters, and it would require knowing the details of the  
documents added/removed to know which caches could be copied.

Can someone shed light on the scenarios where blindly copying over  
any cached filters (or query results) makes sense?

Thanks,
        Erik