Elasticsearch currently allows user to provide a third dimension in WKT but it does not support explicitly declaring that dimension in WKT as stated in the standard. We should enhance our WKT parser to support it, e.g:

POINT Z (0 0 0) -> must have three dimensions
POINT M (0 0 0) -> must have three dimensions

Good to have. The standard defines the possibility to have geometries with 4 dimension, an extra dimension for height and another extra dimension for measurement. Elasticsearch does not allow a fourth dimension.

POINT ZM (0 0 0 0) -> must have four dimensions