The log server search engine service consumes a high percentage of CPU cycles, at least 25% at any particular time and might reach 60% to 100% of the total CPU available. Even when no users are connected to any of the repositories, this service still keeps using CPU at varied rates.
Log server is used for logging and monitoring data. The primary reason more CPU may be consumed would be if a machine has a lot of Jobs being executed in TAC, and you frequently check the Monitoring > Logging page.
To disable the display, see How to disable the display of log events on the Logging page of Talend Administrative Center.
For more information about Talend logging modules, see Installing and configuring the Talend logging modules.