# Log4j2.properties
**URL:** https://discuss.elastic.co/t/log4j2-properties/251568
**Category:** Elasticsearch
**Created:** [October 9, 2020, 1:08pm UTC](https://discuss.elastic.co/t/log4j2-properties/251568 "2020-10-09T13:08:25Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@abhinav\_elk](https://discuss.elastic.co/u/abhinav_elk)
#### Post date: [October 9, 2020, 1:08pm UTC](https://discuss.elastic.co/t/log4j2-properties/251568/1 "2020-10-09T13:08:25Z")
Can someone please explain theses two things in the Log4j.2 properties file in ElasticSearch
```
`appender.index_search_slowlog_rolling.policies.time.type=TimeBasedTriggeringPolicy
appender.index_search_slowlog_rolling.policies.time.interval = 1`
```
I want to understand how the slow log file will get deleted, as I have memory limitations.
And I am unable to make it a time based policy - getting the below error
`curl --location --request PUT 'localhost:9200/_settings?pretty' \ --header 'Content-Type: application/json' \ --data-raw '{ "appender.rolling.policies.size.type" : "SizeBasedTriggeringPolicy", "appender.rolling.policies.size.size" : "256MB" }'`
`{ "error": { "root_cause": [{ "type": "illegal_argument_exception", "reason": "unknown setting [index.appender.rolling.policies.size.size] please check that any required plugins are installed, or check the breaking changes documentation for removed settings" } ], "type": "illegal_argument_exception", "reason": "unknown setting [index.appender.rolling.policies.size.size] please check that any required plugins are installed, or check the breaking changes documentation for removed settings", "suppressed": [{ "type": "illegal_argument_exception", "reason": "unknown setting [index.appender.rolling.policies.size.type] please check that any required plugins are installed, or check the breaking changes documentation for removed settings" } ] }, "status": 400 }`
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 6, 2020, 1:08pm UTC](https://discuss.elastic.co/t/log4j2-properties/251568/2 "2020-11-06T13:08:53Z")
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