Fix the init of a nil map in `Index.DeleteObjects`
Fix the init of a nil map in `Index.DeleteObjects`

rastech/algoliasearch-client-go,l4u/algoliasearch-client-go,algolia/algoliasearch-client-go,l4u/algoliasearch-client-go,algolia/algoliasearch-client-go,algoliareadmebot/algoliasearch-client-go