I have create a plist with keepalive= true
Still once process is killed it is not spawned again
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>KeepAlive</key>
<true/>
<key>Label</key>
<string>com.druva.inSyncAgent</string>
<key>ProgramArguments</key>
<array>
<string>/Applications/COMPANY_NAME PRODUCT_NAME.app/Contents/MacOS/PRODUCT_NAME</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>