Dynamically compose query to ElasticSerach with C# nest

gistfile1.txt

/// <summary>
/// returns a lambda function that compose query in And or Or 
/// </summary>
/// <param name="parameters"></param>
/// <returns></returns>
private static Func<QueryContainer, QueryContainer, QueryContainer> GetQueryComposer(QueryTypeEnum queryType)
{
    Func<QueryContainer, QueryContainer, QueryContainer> composer = (q1, q2) => q1 || q2;
    if (queryType == QueryTypeEnum.And)
        composer = (q1, q2) => q1 && q2;
    return composer;
}

.....
        
//Start composing query agains a document represented by class IndexedDocument
//query is dynamically composed based on values of a value parameters object
QueryContainer aQuery = null;

var composer = GetQueryComposer(parameters.QueryType);

//Standard query 
if (!String.IsNullOrEmpty(parameters.Title))
    aQuery = composer(aQuery, Query<IndexedDocument>.Match(
        md => md.OnField(id => id.Title).Query(parameters.Title)));

//query in multifield type.
if (!String.IsNullOrEmpty(parameters.Path))
    aQuery = composer(aQuery, Query<IndexedDocument>.Match(
        md => md.OnField(id => id.Path.Suffix("split")).Query(parameters.Path)));