This is a Hystrix Command Timeout, this timeout is enabled by default per each command, you define the value using the property:
execution.isolation.thread.timeoutInMilliseconds:
This property sets the time in milliseconds after which the caller will
observe a timeout and walk away from the command execution. Hystrix marks > the HystrixCommand as a TIMEOUT, and performs fallback logic.
So you can increase your timeout value or disable the default time out (if apply in your case) for your command using the property:
@HystrixProperty(name = "hystrix.command.default.execution.timeout.enabled", value = "false")
You can find more information here: https://github.com/Netflix/Hystrix/wiki/Configuration#CommandExecution