Elasticsearch shows data as buffer type in Kibana

I am trying to index one json to elastic search.

It seems to be working fine as it is not giving any error.

I have indexed document as below.

await client.index({
            id: fieldId.toString(),
            index: 'project_documents_textfielddata',
            body: {
              FieldId: fieldId,
              DocumentId: documentId,
              Value: fieldData.fieldHTMLText,
            },
            routing: projectId.toString(),
          });

But in elasticsearch kibana it is showing as buffer type as below (I have truncated buffer as it was very long).

{
  "_index": "documenttextfile.files",
  "_id": "6252ab411deaba21fd877c26",
  "_version": 1,
  "_score": 1,
  "_routing": "62505a765ff176cd491f1d1e",
  "_source": {
    "id": "6252ab411deaba21fd877c26",
    "Content": {
      "type": "Buffer",
      "data": [
        10,
     // Some extra large binary content removed for convenient
      48,
      56,
      50,
    ],
    "id": [
      "6252ab411deaba21fd877c26"
    ],
    "Content.type.keyword": [
      "Buffer"
    ]
  }
}

So how can I see my data as is (i.e. in json format) in Kibana. I’ve seen many tutorials on Kibana, they are able to see data in plain text instead of buffer.

Or am I doing anything wrong while indexing? I am basically trying to see the data the way we can see in mongodb compass.

>Solution :

Your fieldData.fieldHTMLTextfield is probably of type Buffer and you simply need to call fieldData.fieldHTMLText.toString()on it in order to transform the buffer to a string.

PS: the problem has nothing to do with Kibana which shows you exactly what you’re sending to Elasticsearch, i.e. a Buffer. So the problem is more related to your understand of Node.js data structures (i.e. Buffer vs string) 😉