Many thanks for the reply.
This is the content of /opt/kaltura/log/sphinx/kaltura_sphinx_searchd.log
[Mon Feb 15 00:34:13.425 2016] [20445] Child process 20446 has been forked
[Mon Feb 15 00:34:13.426 2016] [20446] listening on all interfaces, port=9312
[Mon Feb 15 00:34:13.426 2016] [20446] WARNING: index 'kaltura_base': no fields configured (use rt_field directive) - NOT SERVING
[Mon Feb 15 00:34:13.426 2016] [20446] WARNING: index 'kaltura_kuser_base': no fields configured (use rt_field directive) - NOT SERVING
[Mon Feb 15 00:34:13.453 2016] [20446] accepting connections
[Mon Feb 15 00:36:25.524 2016] [20446] caught SIGTERM, shutting down
[Mon Feb 15 00:36:25.571 2016] [20446] rt: index kaltura_entry: ramchunk saved in 0.002 sec
[Mon Feb 15 00:36:25.575 2016] [20446] shutdown complete
[Mon Feb 15 00:36:25.576 2016] [20445] Child process 20446 has been finished, exit code 0. Watchdog finishes also. Good bye!