If a clustered (replicated) cache is indexed and the cluster will split and enter DEGRADED mode not all entries are available.
But the index might be available local.
So a query might find some entries local and some entries where not all owner are avaiable.
This will end in an unexpected NullPointer instead of a AvailabilityException.

Server will throw:
ERROR [org.infinispan.interceptors.impl.InvocationContextInterceptor] (HotRodServerHandler-8-3) ISPN000136: Error executing command GetAllCommand, writing keys []: java.lang.NullPointerException
at org.infinispan.interceptors.impl.CacheMgmtInterceptor.lambda$visitGetAllCommand$3(CacheMgmtInterceptor.java:120)
at org.infinispan.interceptors.InvocationFinallyAction.apply(InvocationFinallyAction.java:18)
at org.infinispan.interceptors.impl.SimpleAsyncInvocationStage.addCallback(SimpleAsyncInvocationStage.java:67)
at org.infinispan.interceptors.InvocationStage.andFinally(InvocationStage.java:39)
at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNextAndFinally(BaseAsyncInterceptor.java:160)
at org.infinispan.interceptors.impl.CacheMgmtInterceptor.visitGetAllCommand(CacheMgmtInterceptor.java:116)
at org.infinispan.commands.read.GetAllCommand.acceptVisitor(GetAllCommand.java:57)
at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNextAndExceptionally(BaseAsyncInterceptor.java:126)
at org.infinispan.interceptors.impl.InvocationContextInterceptor.visitCommand(InvocationContextInterceptor.java:92)
at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNext(BaseAsyncInterceptor.java:59)
at org.infinispan.interceptors.DDAsyncInterceptor.handleDefault(DDAsyncInterceptor.java:53)
at org.infinispan.interceptors.DDAsyncInterceptor.visitGetAllCommand(DDAsyncInterceptor.java:112)
at org.infinispan.commands.read.GetAllCommand.acceptVisitor(GetAllCommand.java:57)
at org.infinispan.interceptors.DDAsyncInterceptor.visitCommand(DDAsyncInterceptor.java:49)
at org.infinispan.interceptors.impl.AsyncInterceptorChainImpl.invoke(AsyncInterceptorChainImpl.java:281)
at org.infinispan.cache.impl.CacheImpl.getAll(CacheImpl.java:437)
at org.infinispan.cache.impl.CacheImpl.getAll(CacheImpl.java:431)
at org.infinispan.cache.impl.AbstractDelegatingAdvancedCache.getAll(AbstractDelegatingAdvancedCache.java:280)
at org.infinispan.cache.impl.EncoderCache.getAll(EncoderCache.java:403)
at org.infinispan.query.impl.EntityLoader.load(EntityLoader.java:42)
at org.infinispan.query.impl.CacheQueryImpl.list(CacheQueryImpl.java:171)
at org.infinispan.query.dsl.embedded.impl.EmbeddedLuceneQuery.listInternal(EmbeddedLuceneQuery.java:79)
at org.infinispan.query.dsl.embedded.impl.EmbeddedLuceneQuery.list(EmbeddedLuceneQuery.java:73)
at org.infinispan.query.dsl.embedded.impl.DelegatingQuery.list(DelegatingQuery.java:102)
at org.infinispan.query.remote.impl.QueryFacadeImpl.makeResponse(QueryFacadeImpl.java:73)
at org.infinispan.query.remote.impl.QueryFacadeImpl.query(QueryFacadeImpl.java:62)
at org.infinispan.server.hotrod.HotRodServer.query(HotRodServer.java:133)
at org.infinispan.server.hotrod.ContextHandler.realRead(ContextHandler.java:143)
at org.infinispan.server.hotrod.ContextHandler.lambda$channelRead0$0(ContextHandler.java:53)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
at java.lang.Thread.run(Thread.java:748)

Client side:
> 5
Enter person name pattern: test
Jun 28, 2018 4:36:53 PM org.infinispan.client.hotrod.impl.protocol.Codec20 checkForErrorsInResponseStatus
WARN: ISPN004005: Error received from the server: java.lang.NullPointerException
org.infinispan.client.hotrod.exceptions.HotRodClientException:Request for messageId=25 returned server error (status=0x85): java.lang.NullPointerException
at org.infinispan.client.hotrod.impl.protocol.Codec20.checkForErrorsInResponseStatus(Codec20.java:420)
at org.infinispan.client.hotrod.impl.protocol.Codec20.readPartialHeader(Codec20.java:167)
at org.infinispan.client.hotrod.impl.protocol.Codec20.readHeader(Codec20.java:153)
at org.infinispan.client.hotrod.impl.operations.HotRodOperation.readHeaderAndValidate(HotRodOperation.java:60)
at org.infinispan.client.hotrod.impl.operations.QueryOperation.executeOperation(QueryOperation.java:85)
at org.infinispan.client.hotrod.impl.operations.QueryOperation.executeOperation(QueryOperation.java:31)
at org.infinispan.client.hotrod.impl.operations.RetryOnFailureOperation.execute(RetryOnFailureOperation.java:57)
at org.infinispan.client.hotrod.impl.query.RemoteQuery.executeQuery(RemoteQuery.java:73)
at org.infinispan.client.hotrod.impl.query.RemoteQuery.list(RemoteQuery.java:58)
at org.jboss.as.quickstarts.datagrid.hotrod.query.AddressBookManager.queryPersonByName(AddressBookManager.java:149)
at org.jboss.as.quickstarts.datagrid.hotrod.query.AddressBookManager.main(AddressBookManager.java:353)

Other operations like get or keySet() will show the expected behaviour and the client side error is:
> 9
Jun 28, 2018 4:32:41 PM org.infinispan.client.hotrod.impl.protocol.Codec20 checkForErrorsInResponseStatus
WARN: ISPN004005: Error received from the server: org.infinispan.partitionhandling.AvailabilityException: ISPN000305: Cluster is operating in degraded mode because of node failures.
org.infinispan.client.hotrod.exceptions.HotRodClientException:Request for messageId=15 returned server error (status=0x85): org.infinispan.partitionhandling.AvailabilityException: ISPN000305: Cluster is operating in degraded mode because of node failures.
at org.infinispan.client.hotrod.impl.protocol.Codec20.checkForErrorsInResponseStatus(Codec20.java:420)
at org.infinispan.client.hotrod.impl.protocol.Codec20.readPartialHeader(Codec20.java:167)
at org.infinispan.client.hotrod.impl.protocol.Codec20.readHeader(Codec20.java:153)
at org.infinispan.client.hotrod.impl.operations.HotRodOperation.readHeaderAndValidate(HotRodOperation.java:60)
at org.infinispan.client.hotrod.impl.operations.IterationStartOperation.executeOperation(IterationStartOperation.java:55)
at org.infinispan.client.hotrod.impl.operations.IterationStartOperation.executeOperation(IterationStartOperation.java:21)
at org.infinispan.client.hotrod.impl.operations.RetryOnFailureOperation.execute(RetryOnFailureOperation.java:57)
at org.infinispan.client.hotrod.impl.iteration.RemoteCloseableIterator.startInternal(RemoteCloseableIterator.java:127)
at org.infinispan.client.hotrod.impl.iteration.RemoteCloseableIterator.start(RemoteCloseableIterator.java:140)
at org.infinispan.client.hotrod.impl.RemoteCacheImpl.retrieveEntries(RemoteCacheImpl.java:164)
at org.infinispan.client.hotrod.impl.RemoteCacheImpl.retrieveEntries(RemoteCacheImpl.java:170)
at org.infinispan.client.hotrod.impl.RemoteCacheImpl.retrieveEntries(RemoteCacheImpl.java:175)
at org.infinispan.client.hotrod.impl.protocol.Codec23.keyIterator(Codec23.java:27)
at org.infinispan.client.hotrod.impl.RemoteCacheImpl$KeySet.iterator(RemoteCacheImpl.java:561)
at org.jboss.as.quickstarts.datagrid.hotrod.query.AddressBookManager.printAllEntries(AddressBookManager.java:275)
at org.jboss.as.quickstarts.datagrid.hotrod.query.AddressBookManager.main(AddressBookManager.java:361)