How to use the azure-cognitiveservices-search-entitysearch.azure.cognitiveservices.search.entitysearch.entity_search_api.EntitySearchAPIConfiguration function in azure-cognitiveservices-search-entitysearch

def __init__(
            self, credentials, base_url=None):

        self.config = EntitySearchAPIConfiguration(credentials, base_url)
        super(EntitySearchAPI, self).__init__(self.config.credentials, self.config)

        client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
        self.api_version = '1.0'
        self._serialize = Serializer(client_models)
        self._deserialize = Deserializer(client_models)

        self.entities = EntitiesOperations(
            self._client, self.config, self._serialize, self._deserialize)

def __init__(
            self, credentials, base_url=None):

        if credentials is None:
            raise ValueError("Parameter 'credentials' must not be None.")
        if not base_url:
            base_url = 'https://api.cognitive.microsoft.com/bing/v7.0'

        super(EntitySearchAPIConfiguration, self).__init__(base_url)

        self.add_user_agent('azure-cognitiveservices-search-entitysearch/{}'.format(VERSION))

        self.credentials = credentials