Indexed caches and Query not properly working

When we create a cache that can be queried and we add a protobuf schema object, if the cache is indexed a query like 'from people.Person' won't work.

• create a protobuf schema

package people;
message Person {
 required string name = 1;
}

• create a indexed cache

{
 "distributed-cache": {
 "mode": "SYNC",
 "encoding": {
 "key": {
 "media-type": "application/x-protostream"
 },
 "value": {
 "media-type": "application/x-protostream"
 }
 },
 "transaction": {
 "mode": "NONE"
 },
 "indexing": {
 "enabled": true
 },
 "statistics": true
 }
}

Add an entry

{
 "_type": "people.Person",
 "name": "katia"
}

Try the query: from people.Person

The outcome from the REST API

Query error

Error executing search ISPN014054: Trying to execute query `from people.Person`, but no type is indexed on cache.