* Two missing methods to add in the channel layer
* Added delete user/channel posts methods
- Created in both search engines but only implemented in ES
- Add those methods in the search layer
- Included the PermanentDeleteByUser/Channel methods
* Two new delete documents are included in the bleve code with this
change:
- DeleteChannelPosts
- DeleteUserPosts
These two new functions delete post documents from the index-based
in the filed value provided
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