Update 'Install_Configure_ElasticSearch'

Install_Configure_ElasticSearch.md

@@ -38,8 +38,22 @@ network.host: localhost
 
 These are the minimum settings you can start with in order to use Elasticsearch. Now you can start Elasticsearch for the first time.
 
-Start the Elasticsearch service with systemctl. Give Elasticsearch a few moments to start up. Otherwise, you may get errors about not being able to connect. \
+Check if Elasticsearch starts: \
 `sudo systemctl start elasticsearch`
 
 Next, run the following command to enable Elasticsearch to start up every time your server boots: \
 `sudo systemctl enable elasticsearch`
+
+Let's create a new file called 'memory.options' in the 'jvm.options.d' directory so we can define memory requirements when an Elasticsearch instance starts:\
+ `sudo nano /etc/elasticsearch/jvm.options.d/memory.options`
+ 
+  In the file, add the minimum and maximum memory requirements:
+  
+```
+  -Xms1g
+  -Xmx4g
+```
+
+`sudo systemctl restart elasticsearch`
+
+# Step 3- Securing ElasticSearch