CircuitBreaker: Partition availability staleness check background thread should be a daemon thread to not block apps from closing gracefully (#44441)

* CircuitBreaker: Partition availability staleness check background thread should be a daemon thread to not block apps from closing gracefully

* Update CHANGELOG.md

* Update CosmosSchedulers.java

Author: FabianMeiswinkel

sdk/cosmos/azure-cosmos/CHANGELOG.md

@@ -7,6 +7,7 @@
 #### Breaking Changes
 
 #### Bugs Fixed
+* Fixed applications possibly not closing gracefully due to thread `partition-availability-staleness-check` not being a daemon thread. - [PR 44441](https://github.com/Azure/azure-sdk-for-java/pull/44441).
 
 #### Other Changes
 

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/CosmosSchedulers.java

@@ -56,7 +56,8 @@ public class CosmosSchedulers {
         Schedulers.DEFAULT_BOUNDED_ELASTIC_SIZE,
         Schedulers.DEFAULT_BOUNDED_ELASTIC_QUEUESIZE,
         CLIENT_TELEMETRY_BOUNDED_ELASTIC_THREAD_NAME,
-        TTL_FOR_SCHEDULER_WORKER_IN_SECONDS
+        TTL_FOR_SCHEDULER_WORKER_IN_SECONDS,
+        true
     );
 
     // Custom bounded elastic scheduler for open connections

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/circuitBreaker/GlobalPartitionEndpointManagerForCircuitBreaker.java

@@ -51,7 +51,9 @@ public class GlobalPartitionEndpointManagerForCircuitBreaker implements AutoClos
     private final AtomicReference<GlobalAddressResolver> globalAddressResolverSnapshot;
     private final ConcurrentHashMap<URI, String> locationToRegion;
     private final AtomicBoolean isClosed = new AtomicBoolean(false);
-    private final Scheduler partitionRecoveryScheduler = Schedulers.newSingle("partition-availability-staleness-check");
+    private final Scheduler partitionRecoveryScheduler = Schedulers.newSingle(
+        "partition-availability-staleness-check",
+        true);
 
     public GlobalPartitionEndpointManagerForCircuitBreaker(GlobalEndpointManager globalEndpointManager) {
         this.partitionKeyRangeToLocationSpecificUnavailabilityInfo = new ConcurrentHashMap<>();