How to combine prefix query with synonym filter in Elasticsearch?

I'm currently using Elasticsearch 7.16 and came across an issue.

Assume that we have the following data:


Let's assume the synonym file has the following entries (i.e. rooster and chicken are synonym with each other):


The below MATCH query will return both chicken and rooster.

"query": {
    "match": {
      "animal": "chicken"

But the below PREFIX query will only return chicken, but no rooster.

"query": {
    "prefix": {
      "animal": "chic"

What I wanted is for the user to enter just chic and Elasticsearch will return both chicken and rooster.

Is there a way to combine a prefix search with synonym?

This is in my setting:

"filter": {
	"synonyms_animal": {
		"type": "synonym_graph",
		"synonyms_path": "synonyms_animal.txt",
		"updateable": "true"
"analyzer": {
	"custom_synonyms": {
		"filter": [
		"tokenizer": "whitespace"

This is my mapping properties section:

"animal": {
	"type": "text",
	"analyzer": "some_custom_index_analyzer",
	"search_analyzer": "custom_synonyms"

The index_prefixes boundary empowers the ordering of term prefixes to accelerate prefix look. It acknowledges this setting: min_chars. The base prefix length to file. It should be more prominent than 0 and defaults to 2.
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