Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "After the name and type parameters, usually a river requires an extra configuration that can be passed in the _meta property."

A block of code is set as follows:

cluster.name: elasticsearch
node.name: "My wonderful server"
network.host: 192.168.0.1
discovery.zen.ping.unicast.hosts: ["192.168.0.2","192.168.0.3[9300-9400]"]

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

cluster.name: elasticsearch
node.name: "My wonderful server"
network.host: 192.168.0.1
discovery.zen.ping.unicast.hosts: ["192.168.0.2","192.168.0.3[9300-9400]"]

Any command-line input or output is written as follows:

curl -XDELETE 'http://127.0.0.1:9200/_river/my_river/'

New terms and important words are shown in bold. Words you see on the screen, in menus or dialog boxes, for example, appear in the text like this: "If you don't see the cluster statistics, put your node address to the left and click on the connect button."