我们在ubuntu 14.04上运行Elasticsearch 1.7.2，系统有足够的内存和服务器上的其他服务工作得很好。 但有时弹性closures没有任何东西login到它的日志，或任何logging到系统日志。 我怎样才能调查这个问题？ 这是logging下来的日志的一部分：
[2015-11-24 02:10:54,121][DEBUG][index.shard ] [Keen Marlow] [haystack_backup][4] updating index_buffer_size from [64mb] to [4mb] [2015-11-24 02:10:54,121][DEBUG][index.shard ] [Keen Marlow] [product_index_backup][0] updating index_buffer_size from [64m b] to [4mb] [2015-11-24 02:10:54,121][DEBUG][index.shard ] [Keen Marlow] [product_index_backup][1] updating index_buffer_size from [64m b] to [4mb] [2015-11-24 02:10:54,121][DEBUG][index.shard ] [Keen Marlow] [product_index_backup][2] updating index_buffer_size from [64m b] to [4mb] [2015-11-24 02:10:54,121][DEBUG][index.shard ] [Keen Marlow] [product_index_backup][3] updating index_buffer_size from [64m b] to [4mb] [2015-11-24 02:10:54,121][DEBUG][index.shard ] [Keen Marlow] [product_index_backup][4] updating index_buffer_size from [64m b] to [4mb] [2015-11-24 02:11:24,015][INFO ][com.asquera.elasticsearch.plugins.http.HttpBasicServer] [Keen Marlow] Authorization:xx, Host:xx.xx.xx.xx:yy, Path:/, :null, Request-IP:xx.xx.xx.xx, Client-IP:null, X-Client-IPnull [2015-11-24 02:12:15,416][INFO ][com.asquera.elasticsearch.plugins.http.HttpBasicServer] [Keen Marlow] Authorization:Basic xxxx, Host:xx.xx.xx.xx:yy, Path:/product_index/product/webservice.ProductPage.282933/, :null, Request-IP:xx.xx.xx.xx , Client-IP:null, X-Client-IPnull [2015-11-24 02:25:18,402][INFO ][node ] [Stakar] version[1.7.2], pid[16597], build[e43676b/2015-09-14T09:49:53Z] [2015-11-24 02:25:18,402][INFO ][node ] [Stakar] initializing ... [2015-11-24 02:25:18,403][DEBUG][node ] [Stakar] using home [/usr/share/elasticsearch], config [/etc/elasticsearch], data [[/var/lib/elasticsearch]], logs [/var/log/elasticsearch], work [/tmp/elasticsearch], plugins [/usr/share/elasticsearch/plugins] [2015-11-24 02:25:18,550][DEBUG][plugins ] [Stakar] lucene property is not set in plugin es-plugin.properties file. Ski pping test. [2015-11-24 02:25:18,551][DEBUG][plugins ] [Stakar] [/usr/share/elasticsearch/plugins/http-basic-server-plugin/_site] d irectory does not exist. [2015-11-24 02:25:18,552][DEBUG][plugins ] [Stakar] [/usr/share/elasticsearch/plugins/http-basic/_site] directory does not exist. [2015-11-24 02:25:18,553][INFO ][plugins ] [Stakar] loaded [http-basic-server-plugin], sites [] [2015-11-24 02:25:18,581][DEBUG][common.compress.lzf ] using encoder [VanillaChunkDecoder] and decoder[{}] [2015-11-24 02:25:18,605][DEBUG][env ] [Stakar] using node location [[NodePath{path=/var/lib/elasticsearch/torob/no des/0}]], local_node_id [0] 注意到2:12和2:25之间的13分钟差距，我又开始弹性了。 在syslog或auth.log中没有任何相关的东西。 我应该做些什么来进一步调查呢？
更新正如我所说，在syslog中没有任何与此相关的内容。 这是涵盖那部分时间的一部分：
Nov 24 01:19:01 hostname CRON[13408]: (root) CMD (cd / && run-parts --report /etc/cron.hourly) Nov 24 02:19:01 hostname CRON[16223]: (root) CMD (cd / && run-parts --report /etc/cron.hourly) Nov 24 03:19:01 hostname CRON[22518]: (root) CMD (cd / && run-parts --report /etc/cron.hourly)