Change search usage in readme

Author: bidoubiwa

README.md

@@ -312,7 +312,7 @@ If you want to know more about the development workflow or want to contribute, p
 
 - Make a search request:
 
-`client.getIndex<T>('xxx').search(query: string, options?: SearchParams): Promise<SearchResponse<T>>`
+`client.getIndex<T>('xxx').search(query: string, options: SearchParams = {}, method: 'POST' | 'GET' = 'POST'): Promise<SearchResponse<T>>`
 
 ### Indexes <!-- omit in toc -->