Hi where did you added this line OPTIMISTIC_ABOUT_FILE_LOCKING = 1
This is my splunk-launch.conf
# Version 7.0.1
# Modify the following line to suit the location of your Splunk install.
# If unset, Splunk will use the parent of the directory containing the splunk
# CLI executable.
#
# SPLUNK_HOME=/opt/build/splunk-home
# By default, Splunk stores its indexes under SPLUNK_HOME in the
# var/lib/splunk subdirectory. This can be overridden
# here:
#
# SPLUNK_DB=/opt/build/splunk-home/var/lib/splunk
# Splunkd daemon name
SPLUNK_SERVER_NAME=Splunkd
# Splunkweb daemon name
SPLUNK_WEB_NAME=splunkweb
# If SPLUNK_OS_USER is set, then Splunk service will only start
# if the 'splunk [re]start [splunkd]' command is invoked by a user who
# is, or can effectively become via setuid(2), $SPLUNK_OS_USER.
# (This setting can be specified as username or as UID.)
#
# SPLUNK_OS_USER
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