Synonym mapping for classification lookup / classifying documents

Elastic Stack Elasticsearch
3

I tried it as

  "my_stemmer": {
        "type": "stemmer",
        "name": "light_english"
    },

and also:

   "my_stemmer": {
        "type": "kstem",
        "name": "light_english"
    },

bot to no full success thus far. any more suggestions?

if I put stemmer after synonym in analyzer - then results are even more unmanageable when you can't expect what it is going to stem to and building own dictionary is very complicated.