I see two issues. Secondly, all of the open and close square brackets have to be escaped, since they are not introducing character classes. Firstly, " %{SPACE} " will match nothing less than three spaces. I think you want "%{SPACE}". Try
match => { "message" => "\[%{DATA:time_stamp}\]%{SPACE}\[%{IPV4:server_ip}\]%{SPACE}\[%{WORD:process_name}\]%{SPACE}\[%{NUMBER:process_id}\]%{SPACE}\[%{LOGLEVEL:log_level}\]%{SPACE}\[%{GREEDYDATA:log_message}\]" }