API get request search parameter automatically appends '%' at the beginning (if startSearch not set) and the end of the search pattern.
By enabling searchWildcardsEnabled parameter it is possible also to insert '%' in the middle of search pattern:
If set to true enables the use of “*” as a wildcard character in the search parameter.
However this case API does not append '%' characters at the start and end of the search pattern, which is not documented.
So either documentation should be updated or API fixed.