copy_to logic fails when used to copy value from object with dynamic: "strict" to a dynamically mapped field #113049
Description
Elasticsearch Version
8.16
Installed Plugins
No response
Java Version
bundled
OS Version
x
Problem Description
When copy_to values are parsed, we create a custom context via createCopyToContext. This context preserves the dynamic value from parent context which is wrong. That value is for the field that is a source of the copy, not the destination. As a result, when copy_to destination is a dynamically mapped field and
Steps to Reproduce
PUT my-index
{
"mappings": {
"properties": {
"copy_source": {
"dynamic": "strict",
"properties": {
"k": {
"type": "keyword",
"copy_to": "dest"
}
}
}
}
}
}
POST my-index/_bulk?refresh
{ "create": {} }
{ "copy_source": { "k": "let's copy" } }
// Results in this which is wrong
"error": {
"type": "strict_dynamic_mapping_exception",
"reason": "[1:25] mapping set to strict, dynamic introduction of [dest] within [_doc] is not allowed"
}
Logs (if relevant)
No response