dynamic cluster settings

集群支持的可动态修改的配置：https://www.elastic.co/guide/en/elasticsearch/reference/6.4/modules.html
本篇根据cerebro提供功能整理：

ACTION

action.auto_create_index：true 允许自动创建索引（所谓自动创建就是在索引不存在的情况下通过插入数据直接生成索引）；false 禁止自动创建索引；"twitter,index10,-index1*,+ind*" 允许指定索引自动创建
action.destructive_requires_name：true
action.search.shard_count.limit：9223372036854775807

CLUSTER

cluster.blocks.read_only：false
cluster.indices.close.enable：true
cluster.info.update.interval：30s
cluster.info.update.timeout：15s
cluster.routing.allocation.allow_rebalance：indices_all_active
cluster.routing.allocation.awareness.attributes：
cluster.routing.allocation.balance.index：0.55
cluster.routing.allocation.balance.shard：0.45
cluster.routing.allocation.balance.threshold：1.0
cluster.routing.allocation.cluster_concurrent_rebalance：2
cluster.routing.allocation.disk.include_relocations：true
cluster.routing.allocation.disk.reroute_interval：60s
cluster.routing.allocation.disk.threshold_enabled：true
cluster.routing.allocation.disk.watermark.high：90%
cluster.routing.allocation.disk.watermark.low：85%
cluster.routing.allocation.enable：all
cluster.routing.allocation.node_concurrent_incoming_recoveries：2
cluster.routing.allocation.node_concurrent_outgoing_recoveries：2
cluster.routing.allocation.node_concurrent_recoveries：2
cluster.routing.allocation.node_initial_primaries_recoveries：4
cluster.routing.allocation.same_shard.host：false
cluster.routing.allocation.snapshot.relocation_enabled：false
cluster.routing.allocation.total_shards_per_node：-1
cluster.routing.rebalance.enable：ALL
cluster.service.slow_task_logging_threshold：30s

DISCOVERY

discovery.zen.commit_timeout：30s
discovery.zen.minimum_master_nodes：3
discovery.zen.no_master_block：write
discovery.zen.publish_diff.enable：true
discovery.zen.publish_timeout：30s

INDICES

indices.breaker.fielddata.limit：60%
indices.breaker.fielddata.overhead：1.03
indices.breaker.request.limit：60%
indices.breaker.request.overhead：1.0
indices.breaker.total.limit：70%
indices.mapping.dynamic_timeout：30s
indices.recovery.internal_action_long_timeout：1800000ms
indices.recovery.internal_action_timeout：15m
indices.recovery.max_bytes_per_sec：40mb
indices.recovery.recovery_activity_timeout：1800000ms
indices.recovery.retry_delay_network：5s
indices.recovery.retry_delay_state_sync：500ms

NETWORK

network.breaker.inflight_requests.limit：100%
network.breaker.inflight_requests.overhead：1.0

SEARCH

search.default_search_timeout：-1
search.low_level_cancellation：false

XPACK

xpack.ml.node_concurrent_job_allocations：2
xpack.monitoring.collection.cluster.stats.timeout：10s
xpack.monitoring.collection.index.recovery.active_only：false
xpack.monitoring.collection.index.recovery.timeout：10s
xpack.monitoring.collection.index.stats.timeout：10s
xpack.monitoring.collection.interval：10s
xpack.monitoring.collection.ml.job.stats.timeout：10s
xpack.monitoring.history.duration：168h
xpack.security.http.filter.enabled：true
xpack.security.http.filter.enabled：true
xpack.watcher.history.cleaner_service.enabled：true