Well that depends if you have Indexer acknowledgment enabled on your forwarders. If your Forwarder do not acknowledgement enabled any data send before the forwarder received an unable to connect will be dropped the floor. If the Indexer is has reached its minimum free space forwarders will be unable to connect and will attempt to connect to the next available Indexer. When a Forwarder has indexer acknowledgement enabled the forwarder will wait until Indexer has responded with an acknowledgement before clearing the event from the TCPOUT queue.
If you are worried about data loss enable indexer acknowledgement on the Forwarder, but you many have to also increase your TCPOUT queue beyond the default to prevent data from falling to the floor if your queue back up.
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