Search suggestions return values in other languages

[josegar74]

I create a metadata with a keyword in english, french (water, eau). The suggestions service is returning some values in other languages if specifying the q parameter:

1. Using English and empty q parameter: http://localhost:8080/geonetwork/srv/eng/suggest?field=keyword&q=

    [""
    , 
    [
      "Boundaries" ,
      "World" ,
      "water"  ]   
    ] 

This looks ok.

1. Using English and q parameter: http://localhost:8080/geonetwork/srv/eng/suggest?field=keyword&q=ea

    ["ea"
    , 
    [
      "Oceans" ,
      "eau"  ]
    ]

2 issues:

• "eau" I guess should be returned only in French.
• "Oceans" is returned with the query (q=ea), but not in the empty query (case 1), what seem not correct also.

[josegar74]

Seem related to this code:

https://github.com/geonetwork/core-geonetwork/blob/3.0.x/services/src/main/java/org/fao/geonet/services/main/SearchSuggestion.java#L220-L221

https://github.com/geonetwork/core-geonetwork/blob/3.0.x/core/src/main/java/org/fao/geonet/kernel/search/SearchManager.java#L1141

The code uses the language for analysis the text provided and the values retrieved from the index, but seem retrieving all the values for a field, without any language filter (not sure if possible).