Remove mapping types

[dreamer-89]

As part of v2.0 release, mapping types are getting removed from OpenSearch engine. Below are the changes in the opensearch-engine.

• Removal of type from rest end-points
• Removal of include_type_name parameter from API requests.

As part of this issue, please verify if type removal change on OpenSearch engine impacts this repository. If yes, then please remove the type references/usage from this repository

Top level changes are captured in gist below:
https://gist.github.com/dreamer-89/d76eaf639171e8ab32fa7f8b9d6c93d3

For more detailed changes, please check meta issue below:
Related: OpenSearch-engine meta issue

[dreamer-89]

This change goes in v2.0.0 release in OpenSearch repository and is a breaking change. Request maintainer to add appropriate labels.

[dreamer-89]

I looked into this repository source code but did not find any usages of mapping types. @samuel-oci : can you please have a look and confirm ?

[samuel-oci]

Hi @dreamer-89 will check and confirm, should be back shortly with an answer.

[samuel-oci]

Confirmed that mapping types are not used in this repository code.