splunkd.logのエラー内容が変わってました。
IDX側
ERROR TcpInputProc - Failed to resurrect 70 byte message! from src=192.168.127.137:55516
ERROR S2S - Mismatch in configuration between forwarder and indexer. Expecting uncompressed data, but forwarder configured to send compressed data
ERROR TcpInputProc - Received unrecognized signature --splunk-cooked-mode-v2--:C! from src=192.168.127.137:55518
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