Updating a document with elasticsearchjs using typescript throws error

I tried updating a document using elasticsearchjs, using:

export async function esUpdate (index, id, body) {
  return es.update({
    body:  JSON.stringify(body),
    refresh: true,
    type: DocType

It throws error : `Elasticsearch error: {\"msg\":\"[action_request_validation_exception] Validation Failed: 1: script or doc is missing;`

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