The analytics processor is based on the Liferay's Message Bus.
Every destination defined within the Message Bus has its own thread pool. Default configuration for the previous pool starts with 2 threads and can grow up to 5 threads.
Defaults will not be be able to deal with all the load generated from the clients so we need to configure a better defaults. In case the system does not need to deal with high load, clients will be able to configure this file so they can decrease the number of threads.