Support non blocking guarantees on indexing APIs

Hibernate Search indexing SPI used by Infinispan to index the entities do not support non blocking guarantees, meaning that we need a way to do it on Infinispan side, as long as this is not fully supported by Hibernate Search.

For the nature of the Hibernate Search indexing SPI calls using non blocking executor as the Executor is not a viable solution.

Probably the recommended way to handle it it is to use a solution similar to the one used in:

org.infinispan.persistence.sifs.Compactor