Highlighting not working correctly with greek analyzer

Elastic Stack Elasticsearch
1

Hello everyone,

I have a problem with the highlighting in Elasticsearch. I have a field in an index like the following:

"skepseis": {
	"type": "nested", 
	"properties": {
	  "text": {
		"type": "text",
		"analyzer": "greek"
	  }
	}
}

When the user searches with the terms "word1 word2" (where word1 and word2 are parts of the complete words) the correct document returns but the ES highlights only one of the words.

For example, when the user searches for "ΣΥΜΒΟΥΛ ΕΠΙΚΡΑΤ" (instead of "ΣΥΜΒΟΥΛΙΟ ΕΠΙΚΡΑΤΕΙΑΣ"), the ES highlights only the ΣΥΜΒΟΥΛΙΟ and not the ΕΠΙΚΡΑΤΕΙΑΣ.

I think that the problem has to do with the stemming of the two words. But i do not know how to change things to solve this.

The relevant code for highlighting is:

"inner_hits": {
	"name": f"matching_skepseis",
	"size": 10,               
	"highlight": {         
		"fields": {
			"skepseis.text": {"type": "unified"}
		}
	}
}

Any suggestions?