Wildcard search in field values

I need to create a token based search query for an index which has multiple valued field.
Details of the index are added below.
Is it possible to search the material_values field to return only the values starting with say "Po"- so that it only returns Porcelain & Pottery?

Request - GET /0/id/37908?_source=properties.material_values
Response - {
"_index": "0",
"_type": "id",
"_id": "37908",
"_version": 1,
"found": true,
"_source": {
"properties": [
"material_values": [
"Cast Iron",