Search query taking ages to finish in Splunk 7.0.1

[AKG1_old1]

Hello,

I have upgraded Splunk Enterprise to 7.0.1. One of the search query is taking ages to finish it. Same query finished quickly in Splunk 6.x.

Splunk 6.6.1 = 5 secs
Splunk 7.0.1 = 26 mins (still running)

Does anyone have encounter such situation or have idea for this behaviour in Splunk 7.