Added new examples (#1031)

* Added new examples

* Fixed examples links

docs/examples/update.asciidoc

@@ -0,0 +1,92 @@
+[[update_examples]]
+== Update
+
+The update API allows updates of a specific document using the given script. +
+In the following example, we will index a document that also tracks how many times a character has said the given quote, and then we will update the `times` field.
+
+[source,js]
+---------
+'use strict'
+
+const { Client } = require('@elastic/elasticsearch')
+const client = new Client({ node: 'http://localhost:9200' })
+
+async function run () {
+  await client.index({
+    index: 'game-of-thrones',
+    id: '1',
+    body: {
+      character: 'Ned Stark',
+      quote: 'Winter is coming.',
+      times: 0
+    }
+  })
+
+  await client.update({
+    index: 'game-of-thrones',
+    id: '1',
+    body: {
+      script: {
+        lang: 'painless',
+        source: 'ctx._source.times++'
+        // you can also use parameters
+        // source: 'ctx._source.times += params.count',
+        // params: { count: 1 }
+      }
+    }
+  })
+
+  const { body } = await client.get({
+    index: 'game-of-thrones',
+    id: '1'
+  })
+
+  console.log(body)
+}
+
+run().catch(console.log)
+
+---------
+
+With the update API, you can also run a partial update of a document.
+
+[source,js]
+---------
+'use strict'
+
+const { Client } = require('@elastic/elasticsearch')
+const client = new Client({ node: 'http://localhost:9200' })
+
+async function run () {
+  await client.index({
+    index: 'game-of-thrones',
+    id: '1',
+    body: {
+      character: 'Ned Stark',
+      quote: 'Winter is coming.',
+      isAlive: true
+    }
+  })
+
+  await client.update({
+    index: 'game-of-thrones',
+    id: '1',
+    body: {
+      doc: {
+        isAlive: false
+      }
+    }
+  })
+
+  const { body } = await client.get({
+    index: 'game-of-thrones',
+    id: '1'
+  })
+
+  console.log(body)
+}
+
+run().catch(console.log)
+
+
+---------