Fix `Index.SearchSynonyms`
Fix `Index.SearchSynonyms`

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