The default event size limit is 10000 characters. You can override this in props.conf as follows
[yoursourcetypehere]
TRUNCATE = 0
MAX_EVENTS = 10000
Setting TRUNCATE to zero means "no truncation". MAX_EVENTS actually sets "the maximum number of lines per event." MAX_EVENTS only applies to multi-line events, but the default is 256 lines. If you are dealing with multi-line events, you may want to set this to a much larger value.
You can put the props.conf file under an application, if it is application-specific, or under /etc/system/local
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