Terracotta Caching issue with the bulk REST Requests coming in to Integration server.

We have created a flow service exposed as REST on Integration server. Though we made the REST and flow as Stateless:“true” , IS is creating the new session for each request coming in. As a result when there are thousands of requests coming in, IS is trying to create session for each request and Terracotta is going down and Integration servers are going out of cluster.

Did someone experience the similar problem? How can we make the REST calls to not to create a session for each REST Request?

Do we have any config property somewhere on the IS to set to not to create session for each REST request coming in?