text: class SearchModelException(Exception):
      pass
  
  class ConfigError(SearchModelException):
      pass
  
  class InvalidQueryExpression(SearchModelException):
      pass
  
  class InvalidDocument(SearchModelException):
      pass
  
  class IndexDocumentError(SearchModelException):
      pass
  
  class DeleteDocumentError(SearchModelException):
      pass
  
  class UpdateIndexError(SearchModelException):
      pass
  
  