Your deployment server handles clients, if 'siem2' is an indexer, it accepts data inputs. Therefore, on your indexer, you simply need to add a input for /opt/logs/tmcm/ like below.
index=<index of your choice>
#You do not need the whitelist (this is an example below and is commented out)
#If you want to include certain file names from the 'tmcm' directory
disabled = 0