We added a non blocking SPI for CacheWriter bulk operation. Unfortunately all callers of this were not changed to handle this in a non blocking fashion. This has gone largely unchecked due to the actual implementations being blocking. We should fix these references so they will work as these stores become non blocking.

Example locations:

https://github.com/infinispan/infinispan/blob/8cf2e67f190aca109478fbeba6d059d2e054775f/core/src/test/java/org/infinispan/persistence/BaseStoreTest.java#L567
https://github.com/infinispan/infinispan/blob/7d8a18d3425e614ff5e0ebcf42181dbeefad8d9d/core/src/main/java/org/infinispan/persistence/async/AsyncCacheWriter.java#L177