Added examples

docs/examples/bulk.asciidoc

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+= Bulk
+
+The `bulk` API makes it possible to perform many index/delete operations in a single API call. +
+This can greatly increase the indexing speed.
+
+[source,js]
+----
+'use strict'
+
+const { Client } = require('@elastic/elasticsearch')
+const client = new Client({ node: 'http://localhost:9200' })
+
+async function run () {
+  await client.bulk({
+    // here we are forcing an index refresh,
+    // otherwise we will not get any result
+    // in the consequent search
+    refresh: true,
+    body: [
+      // operation to perform
+      { index: { _index: 'game-of-thrones' } },
+      // the document to index
+      {
+        character: 'Ned Stark',
+        quote: 'Winter is coming.'
+      },
+
+      { index: { _index: 'game-of-thrones' } },
+      {
+        character: 'Daenerys Targaryen',
+        quote: 'I am the blood of the dragon.'
+      },
+
+      { index: { _index: 'game-of-thrones' } },
+      {
+        character: 'Tyrion Lannister',
+        quote: 'A mind needs books like a sword needs a whetstone.'
+      }
+    ]
+  })
+
+  // Let's search!
+  const { body } = await client.search({
+    index: 'game-of-thrones',
+    body: {
+      query: {
+        match: {
+          quote: 'winter'
+        }
+      }
+    }
+  })
+
+  console.log(body.hits.hits)
+}
+
+run().catch(console.log)
+----