diff --git a/pages/students/2016/jan_holp/dp2021/zdrojove_subory/cassandra.js b/pages/students/2016/jan_holp/dp2021/zdrojove_subory/cassandra.js
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+//Jan Holp, DP 2021
+
+
+//client1 = cassandra
+//client2 = elasticsearch 
+//-----------------------------------------------------------------
+
+//require the Elasticsearch librray
+const elasticsearch = require('elasticsearch');
+const client2 = new elasticsearch.Client({
+   hosts: [ 'localhost:9200']
+});
+client2.ping({
+     requestTimeout: 30000,
+ }, function(error) {
+ // at this point, eastic search is down, please check your Elasticsearch service
+     if (error) {
+         console.error('Elasticsearch cluster is down!');
+     } else {
+         console.log('Everything is ok');
+     }
+ });
+
+//create new index skweb2
+client2.indices.create({
+    index: 'skweb2'
+}, function(error, response, status) {
+    if (error) {
+        console.log(error);
+    } else {
+        console.log("created a new index", response);
+    }
+});
+
+const cassandra = require('cassandra-driver');
+const client1 = new cassandra.Client({ contactPoints: ['localhost:9042'], localDataCenter: 'datacenter1', keyspace: 'websucker' });
+const query = 'SELECT title  FROM websucker.content WHERE body_size > 0  ALLOW FILTERING';
+client1.execute(query)
+  .then(result => console.log(result)),function(error) {
+    if(error){
+      console.error('Something is wrong!');
+      console.log(error);
+    } else{
+        console.log('Everything is ok');
+    }
+  }; 
+
+/*
+async  function indexData() {
+
+  var i = 0;
+  const query = 'SELECT title  FROM websucker.content WHERE body_size > 0  ALLOW FILTERING'; 
+  client1.execute(query)
+    .then((result) => {
+    try {
+        //for ( i=0; i<15;i++){
+        console.log('%s', result.row[0].title)
+      //}
+  } catch (query) {
+      if (query  instanceof SyntaxError) {
+          console.log( "Neplatne query" );
+        } 
+  }
+
+    
+
+    });
+      
+
+  }
+
+/*
+
+//indexing method
+const bulkIndex = function bulkIndex(index, type, data) {
+	let bulkBody = [];
+	id = 1;
+const errorCount = 0;
+	data.forEach(item => {
+		bulkBody.push({
+			index: {
+				_index: index,
+				_type:  type,
+				_id :   id++,
+			}
+		});
+		bulkBody.push(item);
+	});
+        console.log(bulkBody);
+	client.bulk({body: bulkBody})
+		.then(response => {
+
+			response.items.forEach(item => {
+				if (item.index && item.index.error) {
+					console.log(++errorCount, item.index.error);
+				}
+			});
+			console.log(
+				`Successfully indexed ${data.length - errorCount}
+				out of ${data.length} items`
+			);
+		})
+		.catch(console.err);
+};
+*/
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