The Cluster Stats API allows to retrieve statistics from a cluster wide perspective. The API returns basic index metrics (shard numbers, store size, memory usage) and information about the current nodes that form the cluster (number, roles, os, jvm versions, memory usage, cpu and installed plugins).
GET /_cluster/stats?human&pretty
Will return, for example:
{
"_nodes" : {
"total" : 1,
"successful" : 1,
"failed" : 0
},
"cluster_uuid": "YjAvIhsCQ9CbjWZb2qJw3Q",
"cluster_name": "elasticsearch",
"timestamp": 1459427693515,
"status": "green",
"indices": {
"count": 1,
"shards": {
"total": 5,
"primaries": 5,
"replication": 0,
"index": {
"shards": {
"min": 5,
"max": 5,
"avg": 5
},
"primaries": {
"min": 5,
"max": 5,
"avg": 5
},
"replication": {
"min": 0,
"max": 0,
"avg": 0
}
}
},
"docs": {
"count": 10,
"deleted": 0
},
"store": {
"size": "16.2kb",
"size_in_bytes": 16684
},
"fielddata": {
"memory_size": "0b",
"memory_size_in_bytes": 0,
"evictions": 0
},
"query_cache": {
"memory_size": "0b",
"memory_size_in_bytes": 0,
"total_count": 0,
"hit_count": 0,
"miss_count": 0,
"cache_size": 0,
"cache_count": 0,
"evictions": 0
},
"completion": {
"size": "0b",
"size_in_bytes": 0
},
"segments": {
"count": 4,
"memory": "8.6kb",
"memory_in_bytes": 8898,
"terms_memory": "6.3kb",
"terms_memory_in_bytes": 6522,
"stored_fields_memory": "1.2kb",
"stored_fields_memory_in_bytes": 1248,
"term_vectors_memory": "0b",
"term_vectors_memory_in_bytes": 0,
"norms_memory": "384b",
"norms_memory_in_bytes": 384,
"points_memory" : "0b",
"points_memory_in_bytes" : 0,
"doc_values_memory": "744b",
"doc_values_memory_in_bytes": 744,
"index_writer_memory": "0b",
"index_writer_memory_in_bytes": 0,
"version_map_memory": "0b",
"version_map_memory_in_bytes": 0,
"fixed_bit_set": "0b",
"fixed_bit_set_memory_in_bytes": 0,
"max_unsafe_auto_id_timestamp" : -9223372036854775808,
"file_sizes": {}
}
},
"nodes": {
"count": {
"total": 1,
"data": 1,
"coordinating_only": 0,
"master": 1,
"ingest": 1
},
"versions": [
"7.0.1"
],
"os": {
"available_processors": 8,
"allocated_processors": 8,
"names": [
{
"name": "Mac OS X",
"count": 1
}
],
"pretty_names": [
{
"pretty_name": "Mac OS X",
"count": 1
}
],
"mem" : {
"total" : "16gb",
"total_in_bytes" : 17179869184,
"free" : "78.1mb",
"free_in_bytes" : 81960960,
"used" : "15.9gb",
"used_in_bytes" : 17097908224,
"free_percent" : 0,
"used_percent" : 100
}
},
"process": {
"cpu": {
"percent": 9
},
"open_file_descriptors": {
"min": 268,
"max": 268,
"avg": 268
}
},
"jvm": {
"max_uptime": "13.7s",
"max_uptime_in_millis": 13737,
"versions": [
{
"version": "12",
"vm_name": "OpenJDK 64-Bit Server VM",
"vm_version": "12+33",
"vm_vendor": "Oracle Corporation",
"bundled_jdk": true,
"using_bundled_jdk": true,
"count": 1
}
],
"mem": {
"heap_used": "57.5mb",
"heap_used_in_bytes": 60312664,
"heap_max": "989.8mb",
"heap_max_in_bytes": 1037959168
},
"threads": 90
},
"fs": {
"total": "200.6gb",
"total_in_bytes": 215429193728,
"free": "32.6gb",
"free_in_bytes": 35064553472,
"available": "32.4gb",
"available_in_bytes": 34802409472
},
"plugins": [
{
"name": "analysis-icu",
"version": "7.0.1",
"description": "The ICU Analysis plugin integrates Lucene ICU module into elasticsearch, adding ICU relates analysis components.",
"classname": "org.elasticsearch.plugin.analysis.icu.AnalysisICUPlugin",
"has_native_controller": false
},
...
],
"network_types": {
...
},
"discovery_types": {
...
}
}
}This API can be restricted to a subset of the nodes using node filters:
GET /_cluster/stats/nodes/node1,node*,master:false