old_contents: from haystack import indexes
  from .models import Person, Project, WorkingGroup, NetworkGroup
  
  
  class PersonIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      twitter = indexes.CharField(model_attr='twitter')
      url = indexes.CharField(model_attr='url')
  
      def get_model(self):
          return Person
  
  
  class ProjectIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      twitter = indexes.CharField(model_attr='twitter')
      homepage_url = indexes.CharField(model_attr='homepage_url')
      mailinglist_url = indexes.CharField(model_attr='mailinglist_url')
      sourcecode_url = indexes.CharField(model_attr='sourcecode_url')
  
      def get_model(self):
          return Project
  
  
  class WorkingGroupIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      incubation = indexes.BooleanField(model_attr='incubation')
  
      def get_model(self):
          return WorkingGroup
  
  
  class NetworkGroupIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      mailinglist = indexes.CharField(model_attr='mailinglist')
      homepage = indexes.CharField(model_attr='homepage')
      twitter = indexes.CharField(model_attr='twitter')
  
      def get_model(self):
          return NetworkGroup
  
new_contents: from haystack import indexes
  from .models import Person, Project, WorkingGroup, NetworkGroup
  
  
  class PersonIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      twitter = indexes.CharField(model_attr='twitter')
      url = indexes.CharField(model_attr='url')
  
      def get_model(self):
          return Person
  
  
  class ProjectIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      twitter = indexes.CharField(model_attr='twitter')
      homepage_url = indexes.CharField(model_attr='homepage_url')
      mailinglist_url = indexes.CharField(model_attr='mailinglist_url')
      sourcecode_url = indexes.CharField(model_attr='sourcecode_url')
  
      def get_model(self):
          return Project
  
  
  class WorkingGroupIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      incubation = indexes.BooleanField(model_attr='incubation')
  
      def get_model(self):
          return WorkingGroup
  
  
  class NetworkGroupIndex(indexes.SearchIndex, indexes.Indexable):
      text = indexes.CharField(document=True, use_template=True)
      twitter = indexes.CharField(model_attr='twitter')
      homepage_url = indexes.CharField(model_attr='homepage_url')
      mailinglist_url = indexes.CharField(model_attr='mailinglist_url')
  
      def get_model(self):
          return NetworkGroup
  
subject: Fix references to old model fields