Add .scheduled-commands template

[f-galland]

Description

This PR adds a template for the .scheduled-commands index for the purpose of setting its replicas to 0.

Issues Resolved

Closes #168

[f-galland]

The template is loaded properly upon startup:

fede@tyner:~
$ curl http://localhost:9200/_template/index-template-scheduled-commands?pretty
{
  "index-template-scheduled-commands" : {
    "order" : 0,
    "index_patterns" : [
      ".scheduled-commands"
    ],
    "settings" : {
      "index" : {
        "refresh_interval" : "5s",
        "hidden" : "true",
        "number_of_shards" : "1",
        "number_of_replicas" : "0"
      }
    },
    "mappings" : {
      "dynamic" : "strict",
      "properties" : {
        "enabled_time" : {
          "format" : "epoch_millis",
          "type" : "date"
        },
        "schedule" : {
          "properties" : {
            "interval" : {
              "properties" : {
                "start_time" : {
                  "format" : "epoch_millis",
                  "type" : "date"
                },
                "period" : {
                  "type" : "integer"
                },
                "unit" : {
                  "type" : "keyword"
                }
              }
            }
          }
        },
        "last_update_time" : {
          "format" : "epoch_millis",
          "type" : "date"
        },
        "name" : {
          "type" : "keyword"
        },
        "enabled" : {
          "type" : "boolean"
        }
      }
    },
    "aliases" : { }
  }
}

Indexing a document with the proper format works:

## scheduled.json contains a sample document

fede@tyner:~
$ cat scheduled.json | jq '.hits.hits[0]._source'
{
  "name": "command_manager_scheduler_extension",
  "enabled": true,
  "schedule": {
    "interval": {
      "start_time": 1733480988301,
      "period": 1,
      "unit": "Minutes"
    }
  },
  "enabled_time": 1733480988302,
  "last_update_time": 1733480988302
}

## Indexing the sample document from above
fede@tyner:~
$ curl -XPOST http://localhost:9200/.scheduled-commands/_doc -H 'Content-Type: application/json' -d $(cat scheduled.json | jq -c '.hits.hits[0]._source')
{"_index":".scheduled-commands","_id":"Hr2em5MBoZTQTWo9JuC1","_version":1,"result":"created","_shards":{"total":1,"successful":1,"failed":0},"_seq_no":0,"_primary_term":1}

## We get a proper response
fede@tyner:~
$ curl http://localhost:9200/.scheduled-commands/_search?pretty
{
  "took" : 3,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : ".scheduled-commands",
        "_id" : "Hr2em5MBoZTQTWo9JuC1",
        "_score" : 1.0,
        "_source" : {
          "name" : "command_manager_scheduler_extension",
          "enabled" : true,
          "schedule" : {
            "interval" : {
              "start_time" : 1733480988301,
              "period" : 1,
              "unit" : "Minutes"
            }
          },
          "enabled_time" : 1733480988302,
          "last_update_time" : 1733480988302
        }
      }
    ]
  }
}

[QU3B1M]

The index is being created at plugin startup

curl -k -s "http://127.0.0.1:9200/_cat/indices/.*"
green open .scheduled-commands ovPW-_YlRLmAxW80rSWTKA 1 0 1 0 5.5kb 5.5kb

Template is loaded correctly

curl "http://localhost:9200/_template/index-template-scheduled-commands?pretty"
{
  "index-template-scheduled-commands" : {
    "order" : 0,
    "index_patterns" : [
      ".scheduled-commands"
    ],
    "settings" : {
      "index" : {
        "refresh_interval" : "5s",
        "hidden" : "true",
        "number_of_shards" : "1",
        "number_of_replicas" : "0"
      }
    },
    "mappings" : {
      "dynamic" : "strict",
      "properties" : {
        "enabled_time" : {
          "format" : "epoch_millis",
          "type" : "date"
        },
        "schedule" : {
          "properties" : {
            "interval" : {
              "properties" : {
                "start_time" : {
                  "format" : "epoch_millis",
                  "type" : "date"
                },
                "period" : {
                  "type" : "integer"
                },
                "unit" : {
                  "type" : "keyword"
                }
              }
            }
          }
        },
        "last_update_time" : {
          "format" : "epoch_millis",
          "type" : "date"
        },
        "name" : {
          "type" : "keyword"
        },
        "enabled" : {
          "type" : "boolean"
        }
      }
    },
    "aliases" : { }
  }
}

Document indexed

curl "http://localhost:9200/.scheduled-commands/_search?pretty"
{
  "took" : 4,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : ".scheduled-commands",
        "_id" : "roMcnJMBlwwGYiisRW4W",
        "_score" : 1.0,
        "_source" : {
          "name" : "command_manager_scheduler_extension",
          "enabled" : true,
          "schedule" : {
            "interval" : {
              "start_time" : 1733490918679,
              "period" : 1,
              "unit" : "Minutes"
            }
          },
          "enabled_time" : 1733490918679,
          "last_update_time" : 1733490918679
        }
      }
    ]
  }
}

[QU3B1M]

LGTM