Hi Mangesh,
Which version of HANA are you currently using?
As of SPS 08: there is only 1 xsengine on a HANA Scale out instance on the MASTER node by default
From SPS09 and above versions; xsengine is by default embedded into the Indexserver, but you can add a separate xsengine service and this will stop the embedded service to be stopped and disabled.
I am not involved with too many applications that use the xsengine so I cannot guide you much on how to handle the bottleneck for xsengine based apps
Sunil