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We’re overhauling Dgraph’s docs to make them clearer and more approachable. If you notice any issues during this transition or have suggestions, please let us know.
Delete Mutations allow you to delete objects of a particular type. We use the following schema to demonstrate some examples. Schema: 
type Author {
  id: ID!
  name: String! @search(by: [hash])
  dob: DateTime
  posts: [Post]
}

type Post {
  postID: ID!
  title: String! @search(by: [term, fulltext])
  text: String @search(by: [fulltext, term])
  datePublished: DateTime
}
Dgraph automatically generates input and return types in the schema for the delete mutation. Delete mutations take filter as an input to select specific objects and returns the state of the objects before deletion. 
deleteAuthor(filter: AuthorFilter!): DeleteAuthorPayload

type DeleteAuthorPayload {
  author(filter: AuthorFilter, order: AuthorOrder, first: Int, offset: Int): [Author]
  msg: String
  numUids: Int
}
Example: delete mutation using variables 
mutation deleteAuthor($filter: AuthorFilter!) {
  deleteAuthor(filter: $filter) {
    msg
    author {
      name
      dob
    }
  }
}
Variables: 
{ "filter": { "name": { "eq": "A.N. Author" } } }

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Examples

You can refer to the following link for more examples.