In case you're changing the sourcetype to enable props/transforms, you can do the same with source stanzas in props: [source::<source name>]
[<spec>]
* This stanza enables properties for a given <spec>.
* A props.conf file can contain multiple stanzas for any number of
different <spec>.
* Follow this stanza name with any number of the following attribute/value
pairs, as appropriate for what you want to do.
* If you do not set an attribute for a given <spec>, the default is used.
<spec> can be:
1. <sourcetype>, the source type of an event.
2. host::<host>, where <host> is the host, or host-matching pattern, for an
event.
3. source::<source>, where <source> is the source, or source-matching
pattern, for an event.
4. rule::<rulename>, where <rulename> is a unique name of a source type
classification rule.
5. delayedrule::<rulename>, where <rulename> is a unique name of a delayed
source type classification rule.
These are only considered as a last resort
before generating a new source type based on the
source seen.
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