fix: Update user-agent to clarify serverless (#85)

* Update user-agent to clarify serverless

* Fix broken test

---------

Co-authored-by: Josh Mock <[email protected]>

Author: elasticmachine

src/client.ts

@@ -164,7 +164,7 @@ export default class Client extends API {
       caFingerprint: null,
       agent: null,
       headers: {
-        'user-agent': `elasticsearch-js/${clientVersion} Node.js ${nodeVersion}; Transport ${transportVersion}; (${os.platform()} ${os.release()} ${os.arch()})`,
+        'user-agent': `elasticsearch-serverless-js/${clientVersion} Node.js ${nodeVersion}; Transport ${transportVersion}; (${os.platform()} ${os.release()} ${os.arch()})`,
         'elastic-api-version': `${apiVersion.slice(0, 4)}-${apiVersion.slice(4, 6)}-${apiVersion.slice(6, 8)}`
       },
       generateRequestId: null,

test/unit/client.test.ts

@@ -461,7 +461,7 @@ test('user agent is in the correct format', t => {
   const client = new Client({ node: 'http://localhost:9200' })
   const agentRaw = client.transport[symbols.kHeaders]['user-agent'] || ''
   const agentSplit = agentRaw.split(/\s+/)
-  t.equal(agentSplit[0].split('/')[0], 'elasticsearch-js')
+  t.equal(agentSplit[0].split('/')[0], 'elasticsearch-serverless-js')
   t.ok(/^\d+\.\d+\.\d+/.test(agentSplit[0].split('/')[1]))
   t.end()
 })