public static class SearchExtensions
{
    public static ITypeSearch<T> FuzzyMatch<T>(this ITypeSearch<T> search, string term, Expression<Func<T, string>> fieldSelector, double? boost = null)
    where T : IContent
    {
        // fetch fieldName for query to be applied on by given fieldSelector.
        var fieldName = search.Client.Conventions.FieldNameConvention.GetFieldNameForAnalyzed(fieldSelector);

        // if term is empty or there is no such field as given, return existing search query.
        if (string.IsNullOrWhiteSpace(term) || fieldName == null)
        {
            return search;
        }

        var fuzzyQuery = new FuzzyQuery(fieldName, term)
        {
            Boost = boost,
            MinSimilarity = Constants.Search.Settings.FuzzyQueryMinSimilarity
        };

        return new Search<T, IQuery>(search, context =>
        {
            // if current search context contains a query, we need to combine existing query with fuzzy query we created.
            if (context.RequestBody.Query != null)
            {
                var boolQuery = new BoolQuery
                {
                    MinimumNumberShouldMatch = 1
                };

                // combine existing query and fuzzy query
                boolQuery.Should.Add(context.RequestBody.Query);
                boolQuery.Should.Add(fuzzyQuery);
                context.RequestBody.Query = boolQuery;
            }
            else
            {
                context.RequestBody.Query = fuzzyQuery;
            }
        });
    }
}