While using ACS Audit log search getting java.lang.UnsupportedOperationException: The query read or traversed more than 300000 ... processing was stopped.

Dear Members,

I am using audit log search in on of my environment but due to "

java.lang.UnsupportedOperationException: The query read or traversed more than 300000 nodes. To avoid affecting other tasks, processing was stopped.

" it is not working even with the path where, there in no activation or any kind of modification has had happened.

To Resolve the issue I have purged the page audit log several time with the Minimum age at 1 and I also checked with In Memory Read Limit of Oak Query Engine config with maximum(600000) but nothing worked for me.

I was referring below guide 

https://helpx.adobe.com/experience-manager/6-3/sites/developing/using/troubleshooting-slow-queries.html 

Is anyone is having any idea what can be causing the issue and what can be the solution for it.

Please revert.

Thanks

Umesh Thakur