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I am using `json` serialization/de-serialization and one of my usecase requires me to `POST` `nd-json` format (multi-query search on elastic search). Any hint or idea on how I can achieve the behaviour?

Probably write your own body content provider, that outputs each item separated by lines.

What http client are you using? Ktor? Something else?

I’m not familiar with retrofit, so you’ll have to find the correct api yourself, but see if there is a way to produce a custom request body. 

Resolved to using `source` query param. The passed param conforms to `application/x-ndjson` . The workaround is

```List&lt;JsonObject&gt;.joinToString("\n", suffix = "\n", transform = { jsonObject -&gt; jsonObject.toString() })```
This yields the string as
```{ "index": "…"}
{ /* query or aggs */ }
{ "index": "…"}
{ /* query or aggs */ }```
Definitely not ideal, but works ..