The following are PostgreSQL specific indexes available from the django.contrib.postgres.indexes module.
BrinIndexclass BrinIndex(fields=[], name=None, pages_per_range=None) [source]
Creates a BRIN index.
The pages_per_range argument takes a positive integer.
GinIndexclass GinIndex [source]
Creates a gin index.
To use this index on data types not in the built-in operator classes, you need to activate the btree_gin extension on PostgreSQL. You can install it using the BtreeGinExtension migration operation.
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    https://docs.djangoproject.com/en/1.11/ref/contrib/postgres/indexes/