I tried to create search index in elastic search using document and manually both gives error:

curl -X PUT "localhost:9200/elastic_book" -H 'Content-Type: application/json' -d'
{
  "mappings": {
    "properties": {
      "title": { "type": "text" },
      "description": { "type": "text" },
      "author": { "type": "text" }
    }
  }
}
'
{"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters:  [author : {type=text}] [description : {type=text}] [title : {type=text}]"}],"type":"mapper_parsing_exception","reason":"Failed to parse mapping [properties]: Root mapping definition has unsupported parameters:  [author : {type=text}] [description : {type=text}] [title : {type=text}]","caused_by":{"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters:  [author : {type=text}] [description : {type=text}] [title : {type=text}]"}},"status":400}

PUBLISHER_INDEX = Index('elastic_book')

PUBLISHER_INDEX.settings(
    number_of_shards=1,
    number_of_replicas=1
)

@PUBLISHER_INDEX.doc_type
class BookDocument(Document):
    title = fields.TextField()
    description = fields.TextField()
    author = fields.TextField()

    class Django:
        model = Book

when i run the python manage.py search_index –rebuild
command it gives : raise HTTP_EXCEPTIONS.get(status_code, TransportError)(
elasticsearch.exceptions.RequestError: RequestError(400, ‘mapper_parsing_exception’, ‘Root mapping definition has unsupported parameters: [author : {type=text}] [description : {type=text}] [title : {type=text}]’)