You want to produce smaller log files by configuring them to contain only error and warning messages, and not info messages.
Solution
Edit the logging level in the logging.yml file, located in the C:\Talend\x.x.x\logserv\elasticsearch-2.4.0\config folder, and change the log level from INFO to WARN or ERROR.
Your updated file should look similar to this:
#es.logger.level: INFO
es.logger.level: WARN
rootLogger: ${es.logger.level}, console, file
logger:
# log action execution errors for easier debugging
action: DEBUG
# deprecation logging, turn to DEBUG to see them
deprecation: INFO, deprecation_log_file
# reduce the logging for aws, too much is logged under the default INFO
com.amazonaws: WARN
# aws will try to do some sketchy JMX stuff, but its not needed.
com.amazonaws.jmx.SdkMBeanRegistrySupport: ERROR
com.amazonaws.metrics.AwsSdkMetrics: ERROR
org.apache.http: WARN
