[FEATURE] Create a state index for workflows.

[amitgalitz]

Is your feature request related to a problem?
Create a state index along with the needed operations that need to be done on the index while provisioning is ongoing. The index will store both the workflow state and other important fields such as UI_metadata and user info.
What solution would you like?

The mapping for the state index will look like this:

{
  "dynamic": false,
  "_meta": {
    "schema_version": 1
  },
  "properties": {
    "schema_version": {
      "type": "integer"
    },
    "workflow_id": {
      "type": "keyword"
    },
    "error": {
      "type": "text"
    }
    "state": {
      "type": "keyword"
    },
    "provisioning_progress": {
      "type": "keyword"
    },
    "provision_start_time": {
      "type": "date",
      "format": "strict_date_time||epoch_millis"
    },
    "provision_end_time": {
      "type": "date",
      "format": "strict_date_time||epoch_millis"
    },
    "user": {
      "type": "nested",
      "properties": {
        "name": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "backend_roles": {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword"
            }
          }
        },
        "roles": {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword"
            }
          }
        },
        "custom_attribute_names": {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword"
            }
          }
        }
      }
    },
   "ui_metadata": {
      "type": "object",
      "enabled": false
    }
}

Do you have any additional context?
We will continue adding new fields to the mapping here as we continue, this will be done over time.

We will also add additional metrics to this index over time like:

{
 "ingest calls": 30,
 "search_calls": 3000,
 "search_failure_count": 0,
 "ingest_failure_count": 0,
 }