Convert date to string string

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@Yoav_Ben_Moha

match => [ "ING_SIGNAL_START_TIME", "YYYY-MM-dd HH:mm:ss.SSS" ]

Your field does not have a space between the date and time it has +, so your pattern has to match that

match => [ "ING_SIGNAL_START_TIME", "YYYY-MM-dd'+'HH:mm:ss.SSS" ]