Update the index with the new key/values.

def update_index(self, key, value):
        "Update the index with the new key/values."
        for k, v in value.items():
            if k in self.indexes:
                # A non-string index value switches it into a lazy one.
                if not isinstance(v, six.string_types):
                    self.index_defs[k]['type'] = 'lazy'
                if v not in self.indexes[k]:
                    self.indexes[k][v] = set([])
                self.indexes[k][v].add(key)