Get members using Examine

MemberSearch.cs

public IEnumerable<ISearchResult> GetMembersByKeys(string[] memberKeys)
{
    if (ExamineManager.Instance.TryGetIndex(Constants.UmbracoIndexes.MembersIndexName, out var index))
    {
        var searcher = index.GetSearcher();
        var criteria = searcher.CreateQuery();
        var query = criteria.GroupedOr(new[] { "__Key" }, memberKeys);
        var searchResults = query.Execute();
        return searchResults;
    }

    return null;
}