Configuring logging
The default Elasticsearch log configuration can cause an excessive number of log messages when a search request is cancelled.
To reduce the number of messages that are logged, complete the following steps:
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Open the Log4j 2 properties file config/log4j2.properties.
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Update the value of the logger.action.levelparameter fromdebugtowarn.
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Save and close the file. 
For more information about logging in Elasticsearch, see Logging configuration.