gistfile1.txt

java.io.FileNotFoundException: /opt/elasticsearch/logs/graylog2_index_search_slowlog.log (No such file or directory)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:142)
        at org.apache.log4j.FileAppender.setFile(FileAppender.java:294)
        at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:165)
        at org.apache.log4j.DailyRollingFileAppender.activateOptions(DailyRollingFileAppender.java:223)
        at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
        at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
        at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
        at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
        at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
        at org.apache.log4j.PropertyConfigurator.parseCatsAndRenderers(PropertyConfigurator.java:672)
        at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:516)
        at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:440)
        at org.elasticsearch.common.logging.log4j.LogConfigurator.configure(LogConfigurator.java:111)
        at org.elasticsearch.bootstrap.Bootstrap.setupLogging(Bootstrap.java:92)
        at org.elasticsearch.bootstrap.Bootstrap.main(Bootstrap.java:176)
        at org.elasticsearch.bootstrap.ElasticSearch.main(ElasticSearch.java:32)
log4j:ERROR Either File or DatePattern options are not set for appender [index_search_slow_log_file].