elasticsearch常用接口和集群动态设置

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1. 查看接口，返回的结果是目录，也就是可用的URL节点，自己把每个节点试一次就基本上明白其用处了
   http://10.202.250.91:9200/_cat/

/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/tasks
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/thread_pool/{thread_pools}
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
/_cat/nodeattrs
/_cat/repositories
/_cat/snapshots/{repository}
/_cat/templates

2. 集群节点查看接口，返回的是节点的配置信息
   http://10.201.207.77:9200/_nodes 获取集群所有节点的所有信息
   http://10.201.207.77:9200/_nodes/nodeId1,nodeId2 获取指定节点的信息
   http://10.201.207.77:9200/_nodes/thread_pool 获取集群所有节点的thread_pool信息
   http://10.201.207.77:9200/_nodes/10.201.207.77/thread_pool 获取集群指定节点的thread_pool信息，可以获取的信息包括settings, os, process, jvm, thread_pool, transport, http, plugins, ingest ,indices

{
_nodes: {
total: 7,
successful: 7,
failed: 0
},
cluster_name: "bd-platform",
nodes: {
1osjMBB3Q3KmOaQKMO2JCA: {
name: "10.201.207.74",
transport_address: "10.201.207.74:9300",
host: "10.201.207.74",
ip: "10.201.207.74",
version: "7.1.0",
build_flavor: "default",
build_type: "tar",
build_hash: "606a173",
total_indexing_buffer: 2138760806,
roles: [
"master",
"data",
"ingest"
],
attributes: {
ml.machine_memory: "52575121408",
ml.max_open_jobs: "20",
xpack.installed: "true"
},
settings: {
cluster: {
initial_master_nodes: [
"10.201.207.71",
"10.201.207.72",
"10.201.207.73"
],
name: "bd-platform"

3. 集群状态接口，返回的是集群的状态,基本上都是见名知义
   http://10.201.207.77:9200/_cluster/state
   http://10.201.207.77:9200/_cluster/health
   http://10.201.207.77:9200/_cluster/stats
   http://10.201.207.77:9200/_cluster/settings?include_defaults=true
   http://10.201.207.77:9200/_cluster/settings

{
cluster_name: "bd-platform",
status: "green",
timed_out: false,
number_of_nodes: 7,
number_of_data_nodes: 7,
active_primary_shards: 13,
active_shards: 30,
relocating_shards: 0,
initializing_shards: 0,
unassigned_shards: 0,
delayed_unassigned_shards: 0,
number_of_pending_tasks: 0,
number_of_in_flight_fetch: 0,
task_max_waiting_in_queue_millis: 0,
active_shards_percent_as_number: 100
}

4. 集群参数动态设置
   PUT http://10.202.250.92:9200/_cluster/settings persistent部分的设置，集群重启后依然有效；transient部分的设置，集群重启后将失效，可以动态设置的参数有很多，也很分散。
   {
   “persistent” : {
   “indices.recovery.max_bytes_per_sec” : “50mb”
   },
   “transient”:{}
   }

5. max_compilations_per_minute参数设置（每分钟可编译的最大脚本数量）
   PUT /_cluster/settings
   {
   “transient”: {
   “script.max_compilations_per_minute”: 40
   }
   }