f17dcc0d_g_Integration_Reference_Manual__Attribute_Description
[Attribute Name] task-executor [Attribute Description] 
Specifies a specific Executor to be used for acknowledgment handling. If not supplied, an internal single threaded executor will be used. Needed on some platforms that require the use of specific task executors such as a WorkManagerTaskExecutor. One thread will be dedicated to handling acknowledgments (if the acknowledge option is true).
Spring Integration Reference Manual