In constructor columnName is passed as parameter.
public esQueryItem ( esDynamicQuery query, string columnName )
However I wasn't able to fint the property ColumnName or something similar.
After some time I understood, that they use implicit operator stringpublic static implicit operator string ( esQueryItem item )which does the magic.However the explicit read-Only property ColumnName will be useful.By the way the help shows 2 different operators as the same
Implicit(esQueryItem) ToString() (to use in GroupBy/OrderBy and such ....) Implicit(esQueryItem) ToString() (to use in GroupBy/OrderBy and such ....)