[[cluster-nodes-stats]]
=== Nodes stats API
++++
<titleabbrev>Nodes stats</titleabbrev>
++++

Returns cluster nodes statistics.

[[cluster-nodes-stats-api-request]]
==== {api-request-title}

`GET /_nodes/stats` +

`GET /_nodes/<node_id>/stats` +

`GET/_nodes/stats/<metric>` +

`GET/_nodes/<node_id>/stats/<metric>` +

`GET /_nodes/stats/<metric>/<index_metric>` +

`GET /_nodes/<node_id>/stats/<metric>/<index_metric>`


[[cluster-nodes-stats-api-desc]]
==== {api-description-title}

You can use the cluster nodes stats API to retrieve statistics for nodes in a cluster.


All the nodes selective options are explained <<cluster-nodes,here>>.

By default, all stats are returned. You can limit the returned information by 
using metrics.

[[cluster-nodes-stats-api-path-params]]
==== {api-path-parms-title}


`<metric>`::
    (Optional, string) Limits the information returned to the specific metrics. 
    A comma-separated list of the following options: 
+
--
  `adaptive_selection`::
      Statistics about <<search-adaptive-replica,adaptive replica selection>>.
      
  `breaker`::
      Statistics about the field data circuit breaker.
      
  `discovery`::
      Statistics about the discovery.
          
  `fs`::
      File system information, data path, free disk space, read/write
      stats.
          
  `http`::
      HTTP connection information.
  
  `indices`::
      Indices stats about size, document count, indexing and deletion times, 
      search times, field cache size, merges and flushes.
      
  `ingest`::
      Statistics about ingest preprocessing.
  
  `jvm`::
      JVM stats, memory pool information, garbage collection, buffer
      pools, number of loaded/unloaded classes.

  `os`::
      Operating system stats, load average, mem, swap.

  `process`::
      Process statistics, memory consumption, cpu usage, open
      file descriptors.

  `thread_pool`::
      Statistics about each thread pool, including current size, queue and 
      rejected tasks.

  `transport`::
      Transport statistics about sent and received bytes in cluster 
      communication.
--

`<index_metric>`::
    (Optional, string) Limit the information returned for `indices` metric to 
    the specific index metrics. It can be used only if `indices` (or `all`) 
    metric is specified. Supported metrics are:
+    
--
    * `completion`
    * `docs`
    * `fielddata`
    * `flush`
    * `get`
    * `indexing`
    * `merge`
    * `query_cache`
    * `recovery`
    * `refresh`
    * `request_cache`
    * `search`
    * `segments`
    * `store`
    * `translog`
    * `warmer`
--

include::{docdir}/rest-api/common-parms.asciidoc[tag=node-id]


[[cluster-nodes-stats-api-query-params]]
==== {api-query-parms-title}

include::{docdir}/rest-api/common-parms.asciidoc[tag=completion-fields]

include::{docdir}/rest-api/common-parms.asciidoc[tag=fielddata-fields]

include::{docdir}/rest-api/common-parms.asciidoc[tag=fields]

include::{docdir}/rest-api/common-parms.asciidoc[tag=groups]

include::{docdir}/rest-api/common-parms.asciidoc[tag=level]

`types`::
    (Optional, string) A comma-separated list of document types for the 
    `indexing` index metric.

include::{docdir}/rest-api/common-parms.asciidoc[tag=timeoutparms]

include::{docdir}/rest-api/common-parms.asciidoc[tag=include-segment-file-sizes]


[[cluster-nodes-stats-api-response-body]]
==== {api-response-body-title}

[[cluster-nodes-stats-api-response-body-indices]]
===== `indices` section

`indices.docs.count`::
(integer)
include::{docdir}/rest-api/common-parms.asciidoc[tag=docs-count]

`indices.docs.deleted`::
(integer)
include::{docdir}/rest-api/common-parms.asciidoc[tag=docs-deleted]

`indices.store.size_in_bytes`::
(integer)
Size, in bytes, of the store.

`indices.indexing.index_total`::
(integer)
Total number of indexing operations.

`indices.indexing.index_time_in_millis`::
(integer)
Total time in milliseconds
spent performing indexing operations.

`indices.indexing.index_current`::
(integer)
Number of indexing operations currently running.

`indices.indexing.index_failed`::
(integer)
Number of failed indexing operations.

`indices.indexing.delete_total`::
(integer)
Total number of deletion operations.

`indices.indexing.delete_time_in_millis`::
(integer)
Time in milliseconds
spent performing deletion operations.

`indices.indexing.delete_current`::
(integer)
Number of deletion operations currently running.

`indices.indexing.noop_update_total`::
(integer)
Total number of noop operations.

`indices.indexing.is_throttled`::
(boolean)
Number of times
operations were throttled.

`indices.indexing.throttle_time_in_millis`::
(integer)
Total time in milliseconds
spent throttling operations.

`indices.get.total`::
(integer)
Total number of get operations.

`indices.get.time_in_millis`::
(integer)
Time in milliseconds
spent performing get operations.

`indices.get.exists_total`::
(integer)
Total number of successful get operations.

`indices.get.exists_time_in_millis`::
(integer)
Time in milliseconds
spent performing successful get operations.

`indices.get.missing_total`::
(integer)
Total number of failed get operations.

`indices.get.missing_time_in_millis`::
(integer)
Time in milliseconds
spent performing failed get operations.

`indices.get.current`::
(integer)
Number of get operations currently running.

`indices.search.open_context`::
(integer)
Number of open search contexts.

`indices.search.query_total`::
(integer)
Total number of query operations.

`indices.search.query_time_in_millis`::
(integer)
Time in milliseconds
spent performing query operations.

`indices.search.query_current`::
(integer)
Number of query operations currently running.

`indices.search.fetch_total`::
(integer)
Total number of fetch operations.

`indices.search.fetch_time_in_millis`::
(integer)
Time in milliseconds
spent performing fetch operations.

`indices.search.fetch_current`::
(integer)
Number of fetch operations currently running.

`indices.search.scroll_total`::
(integer)
Total number of scroll operations.

`indices.search.scroll_time_in_millis`::
(integer)
Time in milliseconds
spent performing scroll operations.

`indices.search.scroll_current`::
(integer)
Number of scroll operations currently running.

`indices.search.suggest_total`::
(integer)
Total number of suggest operations.

`indices.search.suggest_time_in_millis`::
(integer)
Time in milliseconds
spent performing suggest operations.

`indices.search.suggest_current`::
(integer)
Number of suggest operations currently running.

`indices.merges.current`::
(integer)
Number of merge operations currently running.

`indices.merges.current_docs`::
(integer)
Number of document merges currently running.

`indices.merges.current_size_in_bytes`::
(integer)
Memory, in bytes, used performing current document merges.

`indices.merges.total`::
(integer)
Total number of merge operations.

`indices.merges.total_time_in_millis`::
(integer)
Total time in milliseconds
spent performing merge operations.

`indices.merges.total_docs`::
(integer)
Total number of merged documents.

`indices.merges.total_size_in_bytes`::
(integer)
Total size of document merges in bytes.

`indices.merges.total_stopped_time_in_millis`::
(integer)
Total time in milliseconds
spent stopping merge operations.

`indices.merges.total_throttled_time_in_millis`::
(integer)
Total time in milliseconds
spent throttling merge operations.

`indices.merges.total_auto_throttle_in_bytes`::
(integer)
Total time in milliseconds
spent automatically throttling merge operations.

`indices.refresh.total`::
(integer)
Total number of refresh operations.

`indices.refresh.total_time_in_millis`::
(integer)
Total time in milliseconds
spent performing refresh operations.

`indices.refresh.external_total`::
(integer)
Total number of external refresh operations.

`indices.refresh.external_total_time_in_millis`::
(integer)
Total time in milliseconds
spent performing external operations.

`indices.refresh.listeners`::
(integer)
Number of refresh listeners.

`indices.flush.total`::
(integer)
Number of flush operations.

`indices.flush.periodic`::
(integer)
Number of flush periodic operations.

`indices.flush.total_time_in_millis`::
(integer)
Total time in milliseconds
spent performing flush operations.

`indices.warmer.current`::
(integer)
Number of active index warmers.

`indices.warmer.total`::
(integer)
Total number of index warmers.

`indices.warmer.total_time_in_millis`::
(integer)
Total time in milliseconds
spent performing index warming operations.

`indices.query_cache.memory_size_in_bytes`::
(integer)
Memory, in bytes, used for query cache.

`indices.query_cache.total_count`::
(integer)
Total count of hits, misses, and cached queries
in the query cache.

`indices.query_cache.hit_count`::
(integer)
Number of query cache hits.

`indices.query_cache.miss_count`::
(integer)
Number of query cache misses.

`indices.query_cache.cache_size`::
(integer)
Size, in bytes, of the query cache.

`indices.query_cache.cache_count`::
(integer)
Count of queries
in the query cache.

`indices.query_cache.evictions`::
(integer)
Number of query cache evictions.

`indices.fielddata.memory_size_in_bytes`::
(integer)
Memory, in bytes, used for fielddata cache.

`indices.fielddata.evictions`::
(integer)
Number of fielddata evictions.

`indices.completion.size_in_bytes`::
(integer)
Memory, in bytes, used for completion.

`indices.segments.count`::
(integer)
Number of segments.

`indices.segments.memory_in_bytes`::
(integer)
Size, in bytes, of segments.

`indices.segments.terms_memory_in_bytes`::
(integer)
Memory, in bytes, used of terms
in segments.

`indices.segments.stored_fields_memory_in_bytes`::
(integer)
Size, in bytes, of stored fields
in segments.

`indices.segments.term_vectors_memory_in_bytes`::
(integer)
Size, in bytes, of term vectors
in segments.

`indices.segments.norms_memory_in_bytes`::
(integer)
Size, in bytes, of normalization factors 
in segments.

`indices.segments.points_memory_in_bytes`::
(integer)
Size, in bytes, of points
in segments.

`indices.segments.doc_values_memory_in_bytes`::
(integer)
Size, in bytes, of doc values
in segments.

`indices.segments.index_writer_memory_in_bytes`::
(integer)
Memory, in bytes, used by the index writer.

`indices.segments.version_map_memory_in_bytes`::
(integer)
Memory, in bytes, used by the version map.

`indices.segments.fixed_bit_set_memory_in_bytes`::
(integer)
Memory, in bytes,
used by fixed bit sets
for nested object field types
and type filters
for <<parent-join,join>> fields.

`indices.segments.max_unsafe_auto_id_timestamp`::
(integer)
Timestamp of the
most recent retry request.

`indices.segments.file_sizes.size_in_bytes`::
(integer)
Size, in bytes,
of the segment file.

`indices.segments.file_sizes.description`::
(string)
Description of the segment file.

`indices.translog.operations`::
(integer)
Number of transaction log operations.

`indices.translog.size_in_bytes`::
(integer)
Size, in bytes, of the transaction log.

`indices.translog.uncommitted_operations`::
(integer)
Number of uncommitted transaction log operations.

`indices.translog.uncommitted_size_in_bytes`::
(integer)
Size, in bytes, of uncommitted transaction log operations.

`indices.translog.earliest_last_modified_age`::
(integer)
Earliest last modified age
for the transaction log.

`indices.request_cache.memory_size_in_bytes`::
(integer)
Memory, in bytes, used by the request cache.

`indices.request_cache.evictions`::
(integer)
Number of request cache operations.

`indices.request_cache.hit_count`::
(integer)
Number of request cache hits.

`indices.request_cache.miss_count`::
(integer)
Number of request cache misses.

`indices.recovery.current_as_source`::
(integer)
Number of recoveries
that used an index shard as a source.

`indices.recovery.current_as_target`::
(integer)
Number of recoveries
that used an index shard as a target.

`indices.recovery.throttle_time_in_millis`::
(integer)
Time in milliseconds
recovery operations were delayed due to throttling.

[[cluster-nodes-stats-api-response-body-fs]]
===== `fs` section

`fs.timestamp`::
    Last time the file stores statistics have been refreshed.

`fs.total.total_in_bytes`::
    Total size (in bytes) of all file stores.

`fs.total.free_in_bytes`::
    Total number of unallocated bytes in all file stores.

`fs.total.available_in_bytes`::
    Total number of bytes available to this Java virtual machine on all file 
    stores. Depending on OS or process level restrictions, this might appear 
    less than `fs.total.free_in_bytes`. This is the actual amount of free disk 
    space the {es} node can utilise.

`fs.data`::
    List of all file stores.

`fs.data.path`::
    Path to the file store.

`fs.data.mount`::
    Mount point of the file store (ex: /dev/sda2).

`fs.data.type`::
    Type of the file store (ex: ext4).

`fs.data.total_in_bytes`::
    Total size (in bytes) of the file store.

`fs.data.free_in_bytes`::
    Total number of unallocated bytes in the file store.

`fs.data.available_in_bytes`::
    Total number of bytes available to this Java virtual machine on this file 
    store.

`fs.io_stats.devices` (Linux only)::
    Array of disk metrics for each device that is backing an {es} data path. 
    These disk metrics are probed periodically and averages between the last 
    probe and the current probe are computed.

`fs.io_stats.devices.device_name` (Linux only)::
    The Linux device name.

`fs.io_stats.devices.operations` (Linux only)::
    The total number of read and write operations for the device completed since 
    starting {es}.

`fs.io_stats.devices.read_operations` (Linux only)::
    The total number of read operations for the device completed since starting 
    {es}.

`fs.io_stats.devices.write_operations` (Linux only)::
    The total number of write operations for the device completed since starting 
    {es}.

`fs.io_stats.devices.read_kilobytes` (Linux only)::
    The total number of kilobytes read for the device since starting {es}.

`fs.io_stats.devices.write_kilobytes` (Linux only)::
    The total number of kilobytes written for the device since starting {es}.

`fs.io_stats.operations` (Linux only)::
    The total number of read and write operations across all devices used by 
    {es} completed since starting {es}.

`fs.io_stats.read_operations` (Linux only)::
    The total number of read operations for across all devices used by {es} 
    completed since starting {es}.

`fs.io_stats.write_operations` (Linux only)::
    The total number of write operations across all devices used by {es} 
    completed since starting {es}.

`fs.io_stats.read_kilobytes` (Linux only)::
    The total number of kilobytes read across all devices used by {es} since 
    starting {es}.

`fs.io_stats.write_kilobytes` (Linux only)::
    The total number of kilobytes written across all devices used by {es} since 
    starting {es}.


[[cluster-nodes-stats-api-response-body-os]]
===== `os` section

`os.timestamp`::
    Last time the operating system statistics have been refreshed.

`os.cpu.percent`::
    Recent CPU usage for the whole system, or -1 if not supported.

`os.cpu.load_average.1m`::
    One-minute load average on the system (field is not present if one-minute 
    load average is not available).
    
`os.cpu.load_average.5m`::
    Five-minute load average on the system (field is not present if five-minute 
    load average is not available).

`os.cpu.load_average.15m`::
    Fifteen-minute load average on the system (field is not present if 
    fifteen-minute load average is not available).

`os.mem.total_in_bytes`::
    Total amount of physical memory in bytes.

`os.mem.free_in_bytes`::
    Amount of free physical memory in bytes.

`os.mem.free_percent`::
    Percentage of free memory.

`os.mem.used_in_bytes`::
    Amount of used physical memory in bytes.

`os.mem.used_percent`::
    Percentage of used memory.

`os.swap.total_in_bytes`::
    Total amount of swap space in bytes.

`os.swap.free_in_bytes`::
    Amount of free swap space in bytes.

`os.swap.used_in_bytes`::
    Amount of used swap space in bytes.

`os.cgroup.cpuacct.control_group` (Linux only)::
    The `cpuacct` control group to which the {es} process belongs.

`os.cgroup.cpuacct.usage_nanos` (Linux only)::
    The total CPU time (in nanoseconds) consumed by all tasks in the same cgroup 
    as the {es} process.

`os.cgroup.cpu.control_group` (Linux only)::
    The `cpu` control group to which the {es} process belongs.

`os.cgroup.cpu.cfs_period_micros` (Linux only)::
    The period of time (in microseconds) for how regularly all tasks in the same 
    cgroup as the {es} process should have their access to CPU resources 
    reallocated.

`os.cgroup.cpu.cfs_quota_micros` (Linux only)::
    The total amount of time (in microseconds) for which all tasks in
    the same cgroup as the {es} process can run during one period 
    `os.cgroup.cpu.cfs_period_micros`.

`os.cgroup.cpu.stat.number_of_elapsed_periods` (Linux only)::
    The number of reporting periods (as specified by
    `os.cgroup.cpu.cfs_period_micros`) that have elapsed.

`os.cgroup.cpu.stat.number_of_times_throttled` (Linux only)::
    The number of times all tasks in the same cgroup as the {es} process have 
    been throttled.

`os.cgroup.cpu.stat.time_throttled_nanos` (Linux only)::
    The total amount of time (in nanoseconds) for which all tasks in the same 
    cgroup as the {es} process have been throttled.

`os.cgroup.memory.control_group` (Linux only)::
    The `memory` control group to which the {es} process belongs.

`os.cgroup.memory.limit_in_bytes` (Linux only)::
    The maximum amount of user memory (including file cache) allowed for all 
    tasks in the same cgroup as the {es} process. This value can be too big to 
    store in a `long`, so is returned as a string so that the value returned can 
    exactly match what the underlying operating system interface returns. Any 
    value that is too large to parse into a `long` almost certainly means no 
    limit has been set for the cgroup.

`os.cgroup.memory.usage_in_bytes` (Linux only)::
    The total current memory usage by processes in the cgroup (in bytes) by all 
    tasks in the same cgroup as the {es} process. This value is stored as a 
    string for consistency with `os.cgroup.memory.limit_in_bytes`.

NOTE: For the cgroup stats to be visible, cgroups must be compiled into the 
kernel, the `cpu` and `cpuacct` cgroup subsystems must be configured and stats 
must be readable from `/sys/fs/cgroup/cpu` and `/sys/fs/cgroup/cpuacct`.

[[cluster-nodes-stats-api-response-body-process]]
===== `process` section

`process.timestamp`::
    Last time the process statistics have been refreshed.

`process.open_file_descriptors`::
    Number of opened file descriptors associated with the current process, or -1 
    if not supported.

`process.max_file_descriptors`::
    Maximum number of file descriptors allowed on the system, or -1 if not 
    supported.

`process.cpu.percent`::
    CPU usage in percent, or -1 if not known at the time the stats are computed

`process.cpu.total_in_millis`::
    CPU time (in milliseconds) used by the process on which the Java virtual 
    machine is running, or -1 if not supported.

`process.mem.total_virtual_in_bytes`::
    Size in bytes of virtual memory that is guaranteed to be available to the 
    running process.

[[cluster-nodes-stats-api-response-body-jvm]]
===== `jvm` section

`jvm.timestamp`::
(integer)
Last time JVM statistics were refreshed.

`jvm.uptime_in_millis`::
(integer)
JVM uptime in milliseconds.

`jvm.mem.heap_used_in_bytes`::
(integer)
Memory, in bytes, currently in use by the heap.

`jvm.mem.heap_used_percent`::
(integer)
Percentage of memory currently in use by the heap.

`jvm.mem.heap_committed_in_bytes`::
(integer)
Amount of memory, in bytes, available for use by the heap.

`jvm.mem.heap_max_in_bytes`::
(integer)
Maximum amount of memory, in bytes, available for use by the heap.

`jvm.mem.non_heap_used_in_bytes`::
(integer)
Non-heap memory used, in bytes.

`jvm.mem.non_heap_committed_in_bytes`::
(integer)
Amount of non-heap memory available, in bytes.

`jvm.mem.pools.young.used_in_bytes`::
(integer)
Memory, in bytes, used by the young generation heap.

`jvm.mem.pools.young.max_in_bytes`::
(integer)
Maximum amount of memory, in bytes, available for use by the young generation
heap.

`jvm.mem.pools.young.peak_used_in_bytes`::
(integer)
Largest amount of memory, in bytes, historically used by the young generation
heap.

`jvm.mem.pools.young.peak_max_in_bytes`::
(integer)
Largest amount of memory, in bytes, historically used by the young generation
heap.

`jvm.mem.pools.survivor.used_in_bytes`::
(integer)
Memory, in bytes, used by the survivor space.

`jvm.mem.pools.survivor.max_in_bytes`::
(integer)
Maximum amount of memory, in bytes, available for use by the survivor space.

`jvm.mem.pools.survivor.peak_used_in_bytes`::
(integer)
Largest amount of memory, in bytes, historically used by the survivor space.

`jvm.mem.pools.survivor.peak_max_in_bytes`::
(integer)
Largest amount of memory, in bytes, historically used by the survivor space.

`jvm.mem.pools.old.used_in_bytes`::
(integer)
Memory, in bytes, used by the old generation heap.

`jvm.mem.pools.old.max_in_bytes`::
(integer)
Maximum amount of memory, in bytes, available for use by the old generation
heap.

`jvm.mem.pools.old.peak_used_in_bytes`::
(integer)
Largest amount of memory, in bytes, historically used by the old generation
heap.

`jvm.mem.pools.old.peak_max_in_bytes`::
(integer)
Highest memory limit, in bytes, historically available for use by the old
generation heap.

`jvm.threads.count`::
(integer)
Number of active threads in use by JVM.

`jvm.threads.peak_count`::
(integer)
Highest number of threads used by JVM.

`jvm.gc.collectors.young.collection_count`::
(integer)
Number of JVM garbage collectors that collect young generation objects.

`jvm.gc.collectors.young.collection_time_in_millis`::
(integer)
Total time in milliseconds spent by JVM collecting young generation objects.

`jvm.gc.collectors.old.collection_count`::
(integer)
Number of JVM garbage collectors that collect old generation objects.

`jvm.gc.collectors.old.collection_time_in_millis`::
(integer)
Total time in milliseconds spent by JVM collecting old generation objects.

`jvm.buffer_pools.mapped.count`::
(integer)
Number of mapped buffer pools.

`jvm.buffer_pools.mapped.used_in_bytes`::
(integer)
Size, in bytes, of mapped buffer pools.

`jvm.buffer_pools.mapped.total_capacity_in_bytes`::
(integer)
Total capacity, in bytes, of mapped buffer pools.

`jvm.buffer_pools.direct.count`::
(integer)
Number of direct buffer pools.

`jvm.buffer_pools.direct.used_in_bytes`::
(integer)
Size, in bytes, of direct buffer pools.

`jvm.buffer_pools.direct.total_capacity_in_bytes`::
(integer)
Total capacity, in bytes, of direct buffer pools.

`jvm.classes.current_loaded_count`::
(integer)
Number of buffer pool classes currently loaded by JVM.

`jvm.classes.total_loaded_count`::
(integer)
Total number of buffer pool classes loaded since the JVM started.

`jvm.classes.total_unloaded_count`::
(integer)
Total number of buffer pool classes unloaded since the JVM started.

[[cluster-nodes-stats-api-response-body-threadpool]]
===== `thread_pool` section

`thread_pool.<thread_pool_name>.threads`::
(integer)
Number of threads in the thread pool.

`thread_pool.<thread_pool_name>.queue`::
(integer)
Number of tasks in queue for the thread pool.

`thread_pool.<thread_pool_name>.active`::
(integer)
Number of active threads in the thread pool.

`thread_pool.<thread_pool_name>.rejected`::
(integer)
Number of tasks rejected by the thread pool executor.

`thread_pool.<thread_pool_name>.largest`::
(integer)
Highest number of active threads in the thread pool.

`thread_pool.<thread_pool_name>.completed`::
(integer)
Number of tasks completed by the thread pool executor.

[[cluster-nodes-stats-api-response-body-ingest]]
===== `ingest` section

`ingest.total.count`::
    (integer)
    Total number of documents ingested during the lifetime of this node.

`ingest.total.time_in_millis`::
    (integer)
    Total time spent preprocessing ingest documents during the lifetime of this
    node.

`ingest.total.current`::
    (integer)
    Total number of documents currently being ingested.

`ingest.total.failed`::
    (integer)
    Total number of failed ingest operations during the lifetime of this node.

`ingest.pipelines.<pipeline_id>.count`::
    (integer)
    Number of documents preprocessed by the ingest pipeline.

`ingest.pipelines.<pipeline_id>.time_in_millis`::
    (integer)
    Total time spent preprocessing documents in the ingest pipeline.

`ingest.pipelines.<pipeline_id>.failed`::
    (integer)
    Total number of failed operations for the ingest pipeline.

`ingest.pipelines.<pipeline_id>.<processor>.count`::
    (integer)
    Number of documents transformed by the processor.

`ingest.pipelines.<pipeline_id>.<processor>.time_in_millis`::
    (integer)
    Time spent by the processor transforming documents.

`ingest.pipelines.<pipeline_id>.<processor>.current`::
    (integer)
    Number of documents currently being transformed by the processor.

`ingest.pipelines.<pipeline_id>.<processor>.failed`::
    (integer)
    Number of failed operations for the processor.

[[cluster-nodes-stats-api-response-body-adaptive-selection]]
===== `adaptive_selection` section

The `adaptive_selection` statistics are keyed by node. For each node:

`adaptive_selection.outgoing_searches`::
    The number of outstanding search requests from the node these stats are for 
    to the keyed node.

`avg_queue_size`::
    The exponentially weighted moving average queue size of search requests on 
    the keyed node.

`avg_service_time_ns`::
    The exponentially weighted moving average service time of search requests on
    the keyed node.

`avg_response_time_ns`::
    The exponentially weighted moving average response time of search requests 
    on the keyed node.

`rank`::
    The rank of this node; used for shard selection when routing search 
    requests.


[[cluster-nodes-stats-api-example]]
==== {api-examples-title}

[source,console]
--------------------------------------------------
# return just indices
GET /_nodes/stats/indices

# return just os and process
GET /_nodes/stats/os,process

# return just process for node with IP address 10.0.0.1
GET /_nodes/10.0.0.1/stats/process
--------------------------------------------------

All stats can be explicitly requested via `/_nodes/stats/_all` or 
`/_nodes/stats?metric=_all`.

You can get information about indices stats on `node`, `indices`, or `shards` 
level.

[source,console]
--------------------------------------------------
# Fielddata summarized by node
GET /_nodes/stats/indices/fielddata?fields=field1,field2

# Fielddata summarized by node and index
GET /_nodes/stats/indices/fielddata?level=indices&fields=field1,field2

# Fielddata summarized by node, index, and shard
GET /_nodes/stats/indices/fielddata?level=shards&fields=field1,field2

# You can use wildcards for field names
GET /_nodes/stats/indices/fielddata?fields=field*
--------------------------------------------------

You can get statistics about search groups for searches executed
on this node.

[source,console]
--------------------------------------------------
# All groups with all stats
GET /_nodes/stats?groups=_all

# Some groups from just the indices stats
GET /_nodes/stats/indices?groups=foo,bar
--------------------------------------------------

[[cluster-nodes-stats-ingest-ex]]
===== Retrieve ingest statistics only

To return only ingest-related node statistics, set the `<metric>` path
parameter to `ingest` and use the
<<common-options-response-filtering,`filter_path`>> query parameter.

[source,console]
--------------------------------------------------
GET /_nodes/stats/ingest?filter_path=nodes.*.ingest
--------------------------------------------------

You can use the `metric` and `filter_path` query parameters to get the same
response.

[source,console]
--------------------------------------------------
GET /_nodes/stats?metric=ingest&filter_path=nodes.*.ingest
--------------------------------------------------

To further refine the response, change the `filter_path` value.
For example, the following request only returns ingest pipeline statistics.

[source,console]
--------------------------------------------------
GET /_nodes/stats?metric=ingest&filter_path=nodes.*.ingest.pipelines
--------------------------------------------------