Highlight

Sample type definition:

from graphene import Node
from graphene_elastic import ElasticsearchObjectType
from graphene_elastic.filter_backends import HighlightFilterBackend

class Post(ElasticsearchObjectType):

    class Meta:

        document = PostDocument
        interfaces = (Node,)
        filter_backends = [
            # ...
            HighlightFilterBackend,  # Important
            # ...
        ]

        # ...

        # For `HighlightFilterBackend` backend
        highlight_fields = {
            'title': {
                'enabled': True,
                'options': {
                    'pre_tags': ["<b>"],
                    'post_tags': ["</b>"],
                }
            },
            'content': {
                'options': {
                    'fragment_size': 50,
                    'number_of_fragments': 3
                }
            },
            'category': {},
        }

        # ...

Sample query:

query {
  allPostDocuments(
        search:{content:{value:"since"}, title:{value:"decide"}},
        highlight:[category, content]
    ) {
    edges {
      node {
        title
        content
        highlight
      }
      cursor
    }
  }
}

Sample response:

{
  "data": {
    "allPostDocuments": {
      "edges": [
        {
          "node": {
            "title": "PM decide.",
            "content": "Cut dog young only. Whole natural state Republican year.\nFinancial oil current sea. Mind large similar probably lawyer since. Son control fire remember.",
            "highlight": {
              "title": [
                "PM <b>decide</b>."
              ],
              "content": [
                "Mind large similar probably lawyer <em>since</em>."
              ]
            }
          },
          "cursor": "YXJyYXljb25uZWN0aW9uOjA="
        },
        {
          "node": {
            "title": "Many add.",
            "content": "Read almost consumer perform water. Really protect push send body wind. Training point since involve public last let new.",
            "highlight": {
              "content": [
                "Training point <em>since</em> involve public last let new."
              ]
            }
          },
          "cursor": "YXJyYXljb25uZWN0aW9uOjE="
        }
    }
  }
}