Completion Suggester Foreign Language Accents Greek - elasticsearch

Question

I am trying to use the Completion suggester with Greek language. Unfortunately I have problems with accents like ά. I've tried a few ways.
One was simply to set the greek analyzer in the mapping the other a lowercase analyzer with asciifolding. No success, with greek analyser I dont even get a result with the accent.
Below is what I did, would be great if anyone can help me out here.
Mapping
PUT t1
{
"mappings": {
"profession" : {
"properties" : {
"text" : {
"type" : "keyword"
},
"suggest" : {
"type" : "completion",
"analyzer": "greek"
}
}
}
}
}
Dummy
POST t1/profession/?refresh
{
"suggest" : {
"input": [ "Μάγειρας"]
}
,"text": "Μάγειρας"
}
Query
GET t1/profession/_search
{ "suggest":
{ "profession" :
{ "prefix" : "Μα"
, "completion" :
{ "field" : "suggest"}
}}}

Answer 1

I found a way to do it with a custom analyzer or via a plugin for es which i highly recommend when it comes to non-latin texts.
Option 1
PUT t1
{ "settings":
{ "analysis":
{ "filter":
{ "greek_lowercase":
{ "type": "lowercase"
, "language": "greek"
}
}
, "analyzer":
{ "autocomplete":
{ "tokenizer": "lowercase"
, "filter":
[ "greek_lowercase" ]
}
}
}}
, "mappings": {
"profession" : {
"properties" : {
"text" : {
"type" : "keyword"
},
"suggest" : {
"type" : "completion",
"analyzer": "autocomplete"
}
}}}
}
Option 2 ICU Plugin
Install ES Plugin:
https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-icu.html
{ "settings": {
"index": {
"analysis": {
"normalizer": {
"latin": {
"filter": [
"custom_latin_transform"
]
}
},
"analyzer": {
"latin": {
"tokenizer": "keyword",
"filter": [
"custom_latin_transform"
]
}
},
"filter": {
"noDelimiter": {"type": "word_delimiter"},
"custom_latin_transform": {
"type": "icu_transform",
"id": "Greek-Latin/UNGEGN; Lower(); NFD; [:Nonspacing Mark:] Remove; NFC"
}
}
}
}
}
, "mappings":
{ "doc" : {
"properties" : {
"verbose" : {
"type" : "keyword"
},
"name" : {
"type" : "keyword"
},
"slugHash":{
"type" : "keyword",
"normalizer": "latin"
},
"level": { "type": "keyword" },
"hirarchy": {
"type" : "keyword"
},
"geopoint": { "type": "geo_point" },
"suggest" :
{ "type" : "completion"
, "analyzer": "latin"
, "contexts":
[ { "name": "level"
, "type": "category"
, "path": "level"
}
]
}}
}
}}