Client-IDs are required on all requests, and I don’t see one up there. Works fine for me with a Client ID
curl -H 'Accept: application/vnd.twitchtv.v5+json' -H 'Client-ID: mine' -X GET https://api.twitch.tv/kraken/streams?game=The+Elder+Scrolls:+Legends\&limit=1\&stream_type=live
{"_total":29,"streams":[{"_id":26460949952,"game":"The Elder Scrolls: Legends","broadcast_platform":"live","community_id":"","community_ids":[],"viewers":1002,"video_height":720,"average_fps":60,"delay":0,"created_at":"2017-10-11T17:13:23Z","is_playlist":false,"stream_type":"live","preview":{"small":"https://static-cdn.jtvnw.net/previews-ttv/live_user_justalazygamer-80x45.jpg","medium":"https://static-cdn.jtvnw.net/previews-ttv/live_user_justalazygamer-320x180.jpg","large":"https://static-cdn.jtvnw.net/previews-ttv/live_user_justalazygamer-640x360.jpg","template":"https://static-cdn.jtvnw.net/previews-ttv/live_user_justalazygamer-{width}x{height}.jpg"},"channel":{"mature":false,"status":"!uptime !drop !prime [24/7 Streams Being Attempted] !Streamlegends","broadcaster_language":"en","display_name":"justalazygamer","game":"The Elder Scrolls: Legends","language":"en","_id":108772101,"name":"justalazygamer","created_at":"2015-12-05T17:12:22.623394Z","updated_at":"2017-10-11T18:06:02.14856Z","partner":true,"logo":"https://static-cdn.jtvnw.net/jtv_user_pictures/5c40f666748e0f40-profile_image-300x300.jpeg","video_banner":null,"profile_banner":"https://static-cdn.jtvnw.net/jtv_user_pictures/45ec516aae4409ff-profile_banner-480.png","profile_banner_background_color":"","url":"https://www.twitch.tv/justalazygamer","views":487415,"followers":12395,"broadcaster_type":"","description":"I enjoy playing game, I just get lazy about it sometimes."}}]}
Without a Client-ID…
curl -H 'Accept: application/vnd.twitchtv.v5+json' -X GET https://api.twitch.tv/kraken/streams?game=The+Elder+Scrolls:+Legends\&limit=1\&stream_type=live
{"error":"Bad Request","status":400,"message":"No client id specified"}
Just like you show above as an error.