refactor: adjust type to new requirements

src/core/types/Guards.ts

@@ -68,11 +68,10 @@ export function isSearchResponse(something: any): something is SCSearchResponse
 /**
  * Type guard to check if something is a multi search response
  *
- *
  * @param something Something to check
  */
 export function isMultiSearchResponse(something: any): something is SCMultiSearchResponse {
   return Object.keys(something).reduce((previousOnesAreSearchResponses, key) => {
     return previousOnesAreSearchResponses && isSearchResponse(something[key]);
-  }, true);
+  }, true as boolean);
 }