Function elasticsearch::serialize_coll_qs

pub fn serialize_coll_qs<S>(
    value: &Option<&[&str]>, 
    serializer: S
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error> where
    S: Serializer, 

Serializes an Option<&[&str]> with Some(value) to a comma separated string of values. Used to serialize values within the query string