This error is caused by the heartbeat function. every 30 seconds the heartbeat will send to indexer. if the indexer don't get it during that time, the indexer writes a log with the timeout message. network devices like a firewall can causing this or long remote connections. I disabled the heartbeat. Other solution could be change the time frequency from 30 seconds...
* How often (in seconds) to send a heartbeat packet to the receiving server.
* Heartbeats are only sent if sendCookedData=true.
* Defaults to 30 (seconds).
It is a mechanism for the forwarder to to know that the receiver (ie indexer) is alive. If the indexer does not send a return packet to the forwarder, the forwarder will declare this receiver unreachable and not forward data to it. By default a packet is sent every 30s.
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