SOLR JOINS not working and not returning any data for simple query

[EXTERNAL Taminidi Ravi (ETI, Automotive-Service-Solutions)]

Hi All,

I am facing a strange behavior with the Solr Server. All my joins are not 
working suddenly after a restart. Individual collections are returning the 
response but when I join the collection , I am getting zero documents. Let me 
know if anyone have same type of issues.