Filter synonym not working

Elastic Stack Elasticsearch
1

I am using ingest processor to ingest/index files like pdf, xls etc.
This is my pipeline:

curl -XPUT 'ES_HOST:ES_PORT/_ingest/pipeline/attachment?pretty' -H 'Content-Type: application/json' -d '{
 "description" : "Extract attachment information encoded in Base64 with UTF-8 charset",
 "processors" : [
   {
     "attachment" : {
       "field" : "data",
       "properties": [ "content", "content_type" ]
     }
   },
   {"remove": {
      "field": "data"
    }
  }
 ]
}

Then I define the doc_poc_syn index and add a custom analyzer to try the synonym feature:

PUT /doc_poc_syn
{
  "mappings": {
    "properties": {
      "attachment.content": {
        "type":  "text"
      }
    }
  },
  "settings": {
    "index": {
      "analysis": {
         "analyzer": {
          "my_analyzer": {
            "tokenizer": "standard",
            "filter": ["my_synonym" ]
          }
        },
        "search_analyzer": {
          "my_analyzer": {
            "tokenizer": "standard",
            "filter": ["my_synonym" ]
          }
        },
        "filter": {
          "my_synonym": {
            "type": "synonym",
            "synonyms": [
              "pandemic, covid"
            ]
          }
        }
      }
    }
  }
}

(The search analyzer should be redundant if I am not wrong)

POST doc_poc_syn/_analyze
{
  "analyzer": "my_analyzer",
  "text": "pandemic"
}

returns as expected but if I run

GET /_search
{
  "query": {
    "match": {
      "attachment.content": {
        "query": "pandemic"
    }
  }
}}

I don't get any results. Instead If I use "covid" a document that added comes up. Any clue?

Thanks!

2

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