Bug when using typesense-java post version 0.0.6 in Kotlin runtime JVM

Guide to reproduce bug in typesense-java after changing to OkHttp client post version 0.0.6.

Run file RunMain.kt and observe the results:

w/ org.typesense:typesense-java:0.0.6:

{"success":true}
{"success":true}

w/ org.typesense:typesense-java:0.0.9-beta4:

{"code":400,"document":"\"{\\\"countryName\\\": \\\"India\\\", \\\"gdp\\\": 5215}\\n{\\\"countryName\\\": \\\"Iran\\\", \\\"gdp\\\": 5215}\"","error":"Bad JSON: not a properly formed document.","success":false}