Unused imports

src/documents/api.py

 from rest_framework import status
 from rest_framework.response import Response
 from rest_framework.generics import ListAPIView, RetrieveAPIView
-from rest_framework.pagination import PageNumberPagination
 from documents.serializers import \
     DocumentSerializer, PageLightSerializer, SearchResultSerializer, \
     VolumeManifestSerializer, PageAnnotationListSerializer
 from documents.models import Document, DocumentType, Page
 from documents.search import search_transcriptions
-from functools import lru_cache
 
 
 class DocumentsList(ListAPIView):