I question anyone who would tell you to fix a leaky pipe with silicone sealant (aka caulk).
You say the leak is from the elbow. Is this the threaded pipe connection? Or from a crimped Pex connection? If it is the threaded connection, it be fully disassembled, and re assembled with new thread compound or with plumber’s Teflon tape.
If you use silicone sealant on the outside of the pipe to fix the leak, the water pressure will push through and the leak will be back and now you will have a mess to clean up before doing it correctly.
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