Solr index deletion

[Nasseam Elkarra]

On a few occasions, our development server crashed and in the process  
solr deleted the index folder. We are suspecting another app on the  
server caused an OutOfMemoryException on Tomcat causing all apps  
including solr to crash.

So my question is why is solr deleting the index? We are not doing any  
updates to the index only reading from it so any insight would be  
appreciated.

Thank you,
Nasseam