Novice user but it looks like your using a file source with no-multi-line have you tried sending using any of the suported drivers ?

no-multi-line: The no-multi-line flag disables line-breaking in the messages; the entire message is converted to a single line. Note that this happens only if the underlying transport method actually supports multi-line messages. Currently the ,syslog(), network(), unix-dgram() drivers support multi-line messages