How to Index an array as separate fields in Elasticsearch

Question

I tried to index as follows:

body: {
            name: form.value.name,
            title: form.value.title,
            description: form.value.description,
            published: new Date().toLocaleString(),
            stash: {
              "title": this.alternativeFields.value,
              "type": "object",
              "dynamic": true
            }
          }

Basically this.alternativeFields.value is an array that contains, for example:

["field1", "field2", "field3"]

And for each position of this array, I would like to create a field in the Elastic document.

Is there any way to do this?