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现在由于 Elasticsearch 集群上的磁盘空间问题，我们需要清理未使用的索引，但我们想加倍确保不会以任何方式使用旧索引。

我们使用了https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-stats.html，但它没有提供最近是否使用过索引的可靠证据。

最好的解决方案是 ES 的一些 API，我们可以通过它快速确定和删除旧索引。

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您可以使用index stats API，它允许您查看自上次重新启动以来给定索引是否已处理搜索或索引请求。

GET index/_stats
=>
  "_all": {
    "primaries": {
      "docs": {
        "count": 396885916,
        "deleted": 1712210
      },
      "store": {
        "size_in_bytes": 207383595268,
        "throttle_time_in_millis": 0
      },
      "indexing": {
        "index_total": 8,               <-- writes are happening if you see this increase
        "index_time_in_millis": 41,
        "index_current": 0,
        "index_failed": 0,
        "delete_total": 0,
        "delete_time_in_millis": 0,
        "delete_current": 0,
        "noop_update_total": 0,
        "is_throttled": false,
        "throttle_time_in_millis": 0
      },
      "get": {
        "total": 0,
        "time_in_millis": 0,
        "exists_total": 0,
        "exists_time_in_millis": 0,
        "missing_total": 0,
        "missing_time_in_millis": 0,
        "current": 0
      },
      "search": {
        "open_contexts": 7,
        "query_total": 30238,           <-- reads are happening if you see this increase
        "query_time_in_millis": 254000,
        "query_current": 0,
        "fetch_total": 816,
        "fetch_time_in_millis": 25997,
        "fetch_current": 0,
        "scroll_total": 7637,
        "scroll_time_in_millis": 686963111,
        "scroll_current": 7,
        "suggest_total": 0,
        "suggest_time_in_millis": 0,
        "suggest_current": 0
      },
于 2019-02-21T07:27:01.813 回答