elasticsearch - 为什么此索引状态为红色:opendistro-ism-config

Question

我认为我什至从未触及过该索引，但是这使我的整个群集状态为红色。不知道它是什么或如何修复，尝试添加另一个节点，但是没有用。
在索引管理 View 中，我可以看到它是唯一的红色索引。问题索引是opendistro-ism-config。我尝试更改索引的副本数，添加节点等无济于事。
编辑
按照@Val的要求，我添加了以下查询。我的索引保持红色状态，垃圾邮件会在我已部署集群的AWS上向我发出警报。我分配了索引，所以我从shard_sizes 的输出中将它们删除了，只剩下一个问题了。我有4 x t2.small 35 GiB SSD，集群中有足够的备用空间。这不是我的产品集群，所以还算不错，但是很烦人。

https://{{ES_DOMAIN}}/_cluster/allocation/explain?include_disk_info&include_yes_decisions

{
    "index": ".opendistro-ism-config",
    "shard": 1,
    "primary": true,
    "current_state": "unassigned",
    "unassigned_info": {
        "reason": "ALLOCATION_FAILED",
        "at": "2020-08-01T09:18:40.288Z",
        "failed_allocation_attempts": 5,
        "details": "failed shard on node [ex3PL3THRHmAxkvMjOwrQQ]: failed to create shard, failure IOException[failed to obtain in-memory shard lock]; nested: ShardLockObtainFailedException[[.opendistro-ism-config][1]: obtaining shard lock timed out after 5000ms, previous lock details: [shard creation] trying to lock for [shard creation]]; ",
        "last_allocation_status": "no_valid_shard_copy"
    },
    "cluster_info": {
        "nodes": {
            "KnCBTiL1TZCGz1DNYfm9_A": {
                "node_name": "ef9116cc46563e2c73d12eb7a8887f4c",
                "least_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 2143232000,
                    "free_bytes": 34579505152,
                    "free_disk_percent": 94.2,
                    "used_disk_percent": 5.8
                },
                "most_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 2143232000,
                    "free_bytes": 34579505152,
                    "free_disk_percent": 94.2,
                    "used_disk_percent": 5.8
                }
            },
            "90rKZw_SSOSlOGWv_WyQQQ": {
                "node_name": "45cfd2c275112972c5e68e7e00295d45",
                "least_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 2144980992,
                    "free_bytes": 34577756160,
                    "free_disk_percent": 94.2,
                    "used_disk_percent": 5.8
                },
                "most_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 2144980992,
                    "free_bytes": 34577756160,
                    "free_disk_percent": 94.2,
                    "used_disk_percent": 5.8
                }
            },
            "2F_QTYueTs69Q7KhCped9w": {
                "node_name": "a8314d5f13c0043f8454997d973e8c03",
                "least_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 1957380096,
                    "free_bytes": 34765357056,
                    "free_disk_percent": 94.7,
                    "used_disk_percent": 5.3
                },
                "most_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 1957380096,
                    "free_bytes": 34765357056,
                    "free_disk_percent": 94.7,
                    "used_disk_percent": 5.3
                }
            },
            "8-oMtA69QvO3bKTAAUPeBw": {
                "node_name": "9c042bb3814270c16b4fba03ff85208d",
                "least_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 2140692480,
                    "free_bytes": 34582044672,
                    "free_disk_percent": 94.2,
                    "used_disk_percent": 5.8
                },
                "most_available": {
                    "total_bytes": 36722737152,
                    "used_bytes": 2140692480,
                    "free_bytes": 34582044672,
                    "free_disk_percent": 94.2,
                    "used_disk_percent": 5.8
                }
            }
        },
        "shard_sizes": {
            "[.opendistro-ism-config][2][r]_bytes": 56497,
            "[.opendistro-ism-config][0][p]_bytes": 53651,
            "[.opendistro-ism-config][0][r]_bytes": 53651,
            "[.opendistro-ism-config][4][p]_bytes": 33157,
            "[.opendistro-ism-config][2][p]_bytes": 56497
            }
        },
        "can_allocate": "no_valid_shard_copy",
        "allocate_explanation": "cannot allocate because a previous copy of the primary shard existed but can no longer be found on the nodes in the cluster",
        "node_allocation_decisions": [
            {
                "node_id": "2F_QTYueTs69Q7KhCped9w",
                "node_name": "a8314d5f13c0043f8454997d973e8c03",
                "node_decision": "no",
                "store": {
                    "found": false
                }
            },
            {
                "node_id": "8-oMtA69QvO3bKTAAUPeBw",
                "node_name": "9c042bb3814270c16b4fba03ff85208d",
                "node_decision": "no",
                "store": {
                    "found": false
                }
            },
            {
                "node_id": "90rKZw_SSOSlOGWv_WyQQQ",
                "node_name": "45cfd2c275112972c5e68e7e00295d45",
                "node_decision": "no",
                "store": {
                    "found": false
                }
            },
            {
                "node_id": "KnCBTiL1TZCGz1DNYfm9_A",
                "node_name": "ef9116cc46563e2c73d12eb7a8887f4c",
                "node_decision": "no",
                "store": {
                    "found": false
                }
            }
        ]
    }

Answer 1

RED群集状态表示缺少一个或多个主索引，并且该索引可能没有该主分片的任何副本，或者es无法将副本提升为主分片。
请按照official ES blog进行故障排除。
如果您没有副本分片，并且丢失了主分片，那么添加另一个节点也无济于事。