Multi-language elastic search mapping setup

Question

I have documents stored in MongoDB like so:

const demoArticle = {
  created: new Date(),
  title: [{
    language: 'english',
    value: 'This is the english title'
  }, {
    language: 'dutch',
    value: 'Dit is de nederlandse titel'
  }]
}

I want to add analyzers to specific languages, which is normally specified like so:

"mappings": {
   "article": {
      "properties": {
         "created": {
            "type": "date"
         },
         "title.value": {
           "type": "text",
           "analyzer": "english"
         }
      }
   }
}

The problem is however: depending on the language set on the child level, it should have an analyzer set according to that same language.

I've stumbled upon Dynamic Templates in ElasticSearch but I was not quite convinced this is suited for this use-case.

Any suggestions?

Answer 1

If you match MongoDB object language property to the exact name of the ES language analyzers all you would be needing than as per the recommended by Elastic way you would just add:

{
  "mappings": {
    "article": {
      "properties": {
        "created": {
          "type": "date"
        },
        "title": {
          "type": "text",
          "fields": {
            "english": {
              "type": "text",
              "analyzer": "english"
            },
            "dutch": {
              "type": "text",
              "analyzer": "dutch"
            },
            "bulgarian": {
              "type": "text",
              "analyzer": "bulgarian"
            }
          }
        }
      }
    }
  }

This way you have nice match on the language/analyzer field between MongoDB and ES.