generate id automatically use POST method

[bts-webber]

Hi,
I modified Elasticsearch().create() to allow it to automatically generate document id using the "POST" method.We can find this fearture in doc:https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-index_.html

[karmi]

Hi @bts-webber, we have found your signature in our records, but it seems like you have signed with a different e-mail than the one used in yout Git commit. Can you please add both of these e-mails into your Github profile (they can be hidden), so we can match your e-mails to your Github profile?

[bts-webber]

Hi @karmi ,done.

[honzakral]

If you want to auto-generate the ID, please use the index API, using create API for that case is not supported. See #615, #516 and #474 for more details.
Thanks!