Error 431 Request Header Fields Too Large with some API Keys

[jwells89]

Describe the bug 🐛
For some users with a large number of permissions (increasing length of the API key), search fails with 431 Request Header Fields Too Large.

To Reproduce 🔍
Steps to reproduce the behavior:

1. Set up a typical search client through instantsearch-android or other user of algoliasearch-client-kotlin
2. Do a search with a long API key
3. Observe described error

Expected behavior 💭
API key is sent in request body instead, producing no error and successfully searching.

Environment:

• OS: Android 14
• Version: instantsearch-android 3.3.0/algoliasearch-client-kotlin 2.1.9

Additional context
Some of our users have complicated, highly individual permissions which results in unavoidably long API keys. In the past, we encountered a similar issue in the iOS version of our app, which had the described fix applied and merged.

The now-archived algoliasearch-client-android which we had been using in our app previously behaved this way, but this was not carried over to algoliasearch-client-kotlin.