Error with Faraday 0.16

[ankane]

Hi, the latest version of Faraday breaks some API calls. For instance, this code:

client = Elasticsearch::Client.new
client.indices.exists?(index: "test")

throws can't modify frozen String (FrozenError).

[rjminchuk]

similar issue here: #722

[schorsch]

i have the same problem with the exist? call, which when an object does not exists bubbles into
elasticsearch-transport-7.3.0/lib/elasticsearch/transport/transport/response.rb:19:in `force_encoding'
which in turn wants to force the response string into UTF-8

[patricklewis]

I was encountering a similar FrozenError in an ActiveRecord model callback:

__elasticsearch__.client.exists?(index: self.class.index_name, id: self.id)

Downgrading faraday from 0.16.2 to 0.15.4 eliminated the errors.

[ankane]

Faraday just released 0.17.0 which fixes the issue.

https://github.com/lostisland/faraday/releases/tag/v0.17.0