Receiving the "index_not_found_exception" message

Elastic Stack Elasticsearch
1

When I send a request to Elastic Search, I get the following error.
In "index name" is the name of the index I created.

{
  "error" : {
    "root_cause" : [
      {
        "type" : "index_not_found_exception",
        "reason" : "no such index [index name]",
        "resource.type" : "index_or_alias",
        "resource.id" : "index_name",
        "index_uuid" : "_na_",
        "index" : "index_name"
      }
    ],
    "type" : "index_not_found_exception",
    "reason" : "no such index [index name]",
    "resource.type" : "index_or_alias",
    "resource.id" : "index name",
    "index_uuid" : "_na_",
    "index" : "index name"
  },
  "status" : 404
}

The index has been removed as follows.
(I don't remember deleting the index.)

curl localhost:9200/_aliases?pretty
{
  "info" : {
    "aliases" : { }
  }
}

curl localhost:9200/_nodes/status?pretty
{
  "_nodes" : {
    "total" : 0,
    "successful" : 0,
    "failed" : 0
  },
  "cluster_name" : "elasticsearch",
  "nodes" : { }
}

ElasticSearch version is 7.0.
About 8GB of data is registered and used as a search database.

Is it possible that the index will automatically disappear?
Am I making a mistake?
If anyone else has had the same phenomenon, please let me know how the index doesn't automatically disappear.

Thank you in advance.

2

No, a request needs to be sent for it to be deleted.

Is there anything in the logs?

3

now i send a request to Elasticsearch, I get this

{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  }
}

curl localhost:9200/_aliases?pretty
{
  "info" : {
    "aliases" : { }
  },
  "index_name" : {
    "aliases" : { }
  }
}

My earlier post is a log from yesterday.

In a normal case, I can receive the following requests

{
  "took" : 3119,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 10000,
      "relation" : "gte"
    },
    "max_score" : 68.169464,
    "hits" : [
      {
        "_index" : "index name",
        "_type" : "_doc",
        "_id" : "wgd0bHIBYbh74euT6vYm",
        "_score" : 68.169464,
        "_source" :
4

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