安全删除设置
action.destructive_requires_name:true，通过该参数禁止通过正则进行index的删除操作
查看是否开启内存锁定
GET _nodes?filter_path=**.mlockall
集群信息：
/_cluster/stats?pretty&human
查看节点的段占用内存
/_cat/nodes?h=id,name,segmentsMemory&pretty
查看某个索引所有segs占用的内存
/_cat/segments/{idxName}?v&s=prirep,shard | awk '{sum+=$10} END {print sum}'
/_cat/segments?v&s=prirep,shard,docs.deleted,docs.count
/_cat/shards?h=id,index,name,segments.memory&pretty
查看节点所有状态信息
/_cat/nodes?v&h=id,ip,port,v,master,name,heap.current,heap.percent,heap.max,ram.current,ram.percent,ram.max,fielddata.memory_size,fielddata.evictions,query_cache.memory_size,query_cache.evictions,request_cache.memory_size,request_cache.evictions,request_cache.hit_count,request_cache.miss_count,segments.memory
查看节点的内存状态
/_cat/nodes?v&h=id,ip,port,v,master,name,heap.current,heap.percent,heap.max,ram.current,ram.percent,ram.max,fielddata.memory_size,query_cache.memory_size,request_cache.memory_size,segments.memory'
?v&h=id,ip,port,v,master,name,heap.current,heap.percent,heap.max,ram.current,ram.percent,ram.max,segments.memory
查看某个索引的所有shard的信息
/_cat/shards?index={idxName}&h=id,name,segments.memory&pretty&v"
/_cat/indices/?index={idxName}&s=segmentsCount:desc&v&h=index,segmentsCount,segmentsMemory,memoryTotal,mergesCurrent,mergesCurrentDocs,storeSize,p,r
查看shard的分配信息：
/_cat/shards?h=index,shard,node,prirep,state,unassigned.reason
查看unsigned 的原因
/_cluster/allocation/explain
查看索引的一些统计信息：
/_cat/indices?v&h=segments.memory
health status index uuid pri rep docs.count docs.deleted creation.date creation.date.string store.size pri.store.size completion.size pri.completion.size fielddata.memory_size pri.fielddata.memory_size fielddata.evictions pri.fielddata.evictions query_cache.memory_size pri.query_cache.memory_size query_cache.evictions pri.query_cache.evictions request_cache.memory_size pri.request_cache.memory_size request_cache.evictions pri.request_cache.evictions request_cache.hit_count pri.request_cache.hit_count request_cache.miss_count pri.request_cache.miss_count flush.total pri.flush.total flush.total_time pri.flush.total_time get.current pri.get.current get.time pri.get.time get.total pri.get.total get.exists_time pri.get.exists_time get.exists_total pri.get.exists_total get.missing_time pri.get.missing_time get.missing_total pri.get.missing_total indexing.delete_current pri.indexing.delete_current indexing.delete_time pri.indexing.delete_time indexing.delete_total pri.indexing.delete_total indexing.index_current pri.indexing.index_current indexing.index_time pri.indexing.index_time indexing.index_total pri.indexing.index_total indexing.index_failed pri.indexing.index_failed merges.current pri.merges.current merges.current_docs pri.merges.current_docs merges.current_size pri.merges.current_size merges.total pri.merges.total merges.total_docs pri.merges.total_docs merges.total_size pri.merges.total_size merges.total_time pri.merges.total_time refresh.total pri.refresh.total refresh.time pri.refresh.time refresh.external_total pri.refresh.external_total refresh.external_time pri.refresh.external_time refresh.listeners pri.refresh.listeners search.fetch_current pri.search.fetch_current search.fetch_time pri.search.fetch_time search.fetch_total pri.search.fetch_total search.open_contexts pri.search.open_contexts search.query_current pri.search.query_current search.query_time pri.search.query_time search.query_total pri.search.query_total search.scroll_current pri.search.scroll_current search.scroll_time pri.search.scroll_time search.scroll_total pri.search.scroll_total segments.count pri.segments.count segments.memory pri.segments.memory segments.index_writer_memory pri.segments.index_writer_memory segments.version_map_memory pri.segments.version_map_memory segments.fixed_bitset_memory pri.segments.fixed_bitset_memory warmer.current pri.warmer.current warmer.total pri.warmer.total warmer.total_time pri.warmer.total_time suggest.current pri.suggest.current suggest.time pri.suggest.time suggest.total pri.suggest.total memory.total pri.memory.total search.throttled
查看集群设置
/_cluster/settings?flat_settings=true&include_defaults=true&pretty
查看集群进行的任务
/_tasks?detailed=true&actions=*forcemerge forcemerge的任务
强制段合并
POST /{idxName}/_forcemerge?max_num_segments=10 最多的段个数: 10
POST /{idxName}/_forcemerge?only_expunge_deletes=true 默认是false， 不能和max_num_segments一起使用，但是它可以多次执行，每次默认是把那些删除的doc占了段10%以上的sement，进行重建。 最好结束之后，再云心过一次force_merge?only_expunge_deletes=false 来合并段
