一、查询语句

GET _cluster/stats?pretty

二、返回值详解

{
  "_nodes": { //节点信息
    "total": 1,
    "successful": 1,
    "failed": 0
  },
  "cluster_name": "elasticsearch", // 集群名称
  "cluster_uuid": "7zP8Nb6aTZWbF9AfNaPW5w", // 集群UUID
  "timestamp": 1664576929289,
  "status": "green",
  "indices": {  // 索引和分片的详细信息
    "count": 3, // 索引的总数量
    "shards": { // 分片的详细信息
      "total": 45, // 索引的分片总数量
      "primaries": 45, // 索引中的主分片数量
      "replication": 0,
      "index": {
        "shards": {
          "min": 5,
          "max": 20,
          "avg": 15
        },
        "primaries": {
          "min": 5,
          "max": 20,
          "avg": 15
        },
        "replication": {
          "min": 0,
          "max": 0,
          "avg": 0
        }
      }
    },
    "docs": { // 文档数据详细信息
      "count": 59561, // 索引库中存储的文档总数量
      "deleted": 106
    },
    "store": { // 数据存储情况信息
      "size_in_bytes": 9785636, // 数据存储的总容量
      "reserved_in_bytes": 0
    },
    "fielddata": {
      "memory_size_in_bytes": 0,
      "evictions": 0
    },
    "query_cache": {
      "memory_size_in_bytes": 0, // 查询是缓存的详细信息
      "total_count": 0,
      "hit_count": 0,
      "miss_count": 0,
      "cache_size": 0,
      "cache_count": 0,
      "evictions": 0
    },
    "completion": {
      "size_in_bytes": 0
    },
    "segments": { // 索引库中段的信息信息
      "count": 143, // 索引库中段的总数量
      "memory_in_bytes": 1017828,
      "terms_memory_in_bytes": 678912,
      "stored_fields_memory_in_bytes": 71000,
      "term_vectors_memory_in_bytes": 0,
      "norms_memory_in_bytes": 84288,
      "points_memory_in_bytes": 0,
      "doc_values_memory_in_bytes": 183628,
      "index_writer_memory_in_bytes": 0,
      "version_map_memory_in_bytes": 0,
      "fixed_bit_set_memory_in_bytes": 24816,
      "max_unsafe_auto_id_timestamp": 1,
      "file_sizes": {

      }
    },
    "mappings": { // 文档映射结构的详细信息
      "field_types": [
        {
          "name": "date",
          "count": 4,
          "index_count": 2
        },
        {
          "name": "float",
          "count": 4,
          "index_count": 1
        },
        {
          "name": "keyword",
          "count": 203,
          "index_count": 3
        },
        {
          "name": "long",
          "count": 210,
          "index_count": 3
        },
        {
          "name": "nested",
          "count": 16,
          "index_count": 2
        },
        {
          "name": "object",
          "count": 42,
          "index_count": 3
        },
        {
          "name": "text",
          "count": 196,
          "index_count": 3
        }
      ]
    },
    "analysis": {
      "char_filter_types": [

      ],
      "tokenizer_types": [

      ],
      "filter_types": [

      ],
      "analyzer_types": [

      ],
      "built_in_char_filters": [

      ],
      "built_in_tokenizers": [

      ],
      "built_in_filters": [

      ],
      "built_in_analyzers": [

      ]
    },
    "versions": [
      {
        "version": "7.11.2",
        "index_count": 3,
        "primary_shard_count": 45,
        "total_primary_bytes": 9785636
      }
    ]
  },
  "nodes": { // 节点信息
    "count": {
      "total": 1, // 集群中的总节点数量
      "coordinating_only": 0,
      "data": 1, // 集群中数据节点的总数量
      "data_cold": 1,
      "data_content": 1,
      "data_hot": 1,
      "data_warm": 1,
      "ingest": 1,
      "master": 1,
      "ml": 1,
      "remote_cluster_client": 1,
      "transform": 1,
      "voting_only": 0
    },
    "versions": [ // 程序版本信息
      "7.11.2"
    ],
    "os": {  // 操作系统相关信息
      "available_processors": 16,
      "allocated_processors": 16,
      "names": [
        {
          "name": "Linux",
          "count": 1
        }
      ],
      "pretty_names": [
        {
          "pretty_name": "Tencent tlinux 2.2 (Final)",
          "count": 1
        }
      ],
      "mem": { // OS的内存使用情况
        "total_in_bytes": 8589934592,
        "free_in_bytes": 5793271808,
        "used_in_bytes": 2796662784,
        "free_percent": 67,
        "used_percent": 33
      }
    },
    "process": { // OS的CPU使用情况
      "cpu": {
        "percent": 0 // 集群中节点的CPU使用率
      },
      "open_file_descriptors": {
        "min": 568,
        "max": 568,
        "avg": 568
      }
    },
    "jvm": { // Java中jvm相关信息
      "max_uptime_in_millis": 9274123949,
      "versions": [  // JDK版本
        {
          "version": "1.8.0_272",
          "vm_name": "OpenJDK 64Bit Server VM",
          "vm_version": "25.272b1",
          "vm_vendor": "Tencent",
          "bundled_jdk": true,
          "using_bundled_jdk": false,
          "count": 1
        }
      ],
      "mem": { // Java堆内存使用情况
        "heap_used_in_bytes": 410827280,
        "heap_max_in_bytes": 1037959168
      },
      "threads": 119
    },
    "fs": { // 数据存储情况
      "total_in_bytes": 53687091200, // 文件系统使用的总容量
      "free_in_bytes": 50719637504, // 文件系统中用户可以使用的容量
      "available_in_bytes": 50719637504
    },
    "plugins": [

    ],
    "network_types": {
      "transport_types": {
        "security4": 1
      },
      "http_types": {
        "security4": 1
      }
    },
    "discovery_types": {
      "zen": 1
    },
    "packaging_types": [
      {
        "flavor": "default",
        "type": "tar",
        "count": 1
      }
    ],
    "ingest": {
      "number_of_pipelines": 1,
      "processor_stats": {
        "gsub": {
          "count": 0,
          "failed": 0,
          "current": 0,
          "time_in_millis": 0
        },
        "script": {
          "count": 0,
          "failed": 0,
          "current": 0,
          "time_in_millis": 0
        }
      }
    }
  }
}