ClassCastException when sorting on incompatible fields #73146
Description
Elasticsearch version (bin/elasticsearch --version): 7.12.1
Description of the problem including expected versus actual behavior:
Elasticsearch returns a ClassCastException when trying to sort on incompatible fields across indexes. Discussing this with @romseygeek, we should be returning a specific error instead.
Steps to reproduce:
PUT index_1
{
"mappings": {
"properties": {
"date": {
"type": "keyword"
}
}
}
}
PUT index_2
{
"mappings": {
"properties": {
"date": {
"type": "date"
}
}
}
}
POST index_1/_doc
{ "date": "2021-05-17" }
POST index_2/_doc
{ "date": "2021-05-17" }
GET index_1,index_2/_search
{ "sort": "date" }
Last query returns:
{
"error" : {
"root_cause" : [ ],
"type" : "search_phase_execution_exception",
"reason" : "",
"phase" : "fetch",
"grouped" : true,
"failed_shards" : [ ],
"caused_by" : {
"type" : "class_cast_exception",
"reason" : "class java.lang.Long cannot be cast to class org.apache.lucene.util.BytesRef (java.lang.Long is in module java.base of loader 'bootstrap'; org.apache.lucene.util.BytesRef is in unnamed module of loader 'app')"
}
},
"status" : 500
}