---
title: "Search Engine Service glossary"
slug: "ses-glossary"
tags: ["Search Engine Service"]
updated: 2026-09-17T09:18:06Z
published: 2026-09-17T09:18:06Z
canonical: "guide.ncloud-docs.com/ses-glossary"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Search Engine Service glossary

Available in Classic and VPC

There are a few terms you must know to use the Search Engine Service. The glossary and the description thereof are as follows.

### Elasticsearch

An open source RESTful search and analysis engine based on Apache Lucene. It is capable of storing various forms of data (such as structured/unstructured data, location information, matrix, etc.) as well as searching by various methods.

### Node

A point of redistribution or communication terminal point. Computers connected to a local network, which is a basic element of networks, and devices inside them are altogether referred to as a node.

### Data node

A component of Elasticsearch Cluster provided by NAVER Cloud Platform's Search Engine Service, which are servers where the actual data are stored, and they only communicate through the coordinator node.

### Master Node

A node that is responsible for managing the cluster, such as creating indexes on the master node cluster or assigning shards to the data node

### Manager Node

A component of Elasticsearch Cluster provided by NAVER Cloud Platform's search engine service, which manages Elasticsearch clusters. It is also set as the coordinator node, acting as the data entry pathway.

### Bucket

Data storage space. The top directory grouping related objects.

### Index

Behavior of analyzing document content and making them into data formats easy to search, or the data itself

### Shard

Units of data partitioned in a DB cluster

### Secure Shell (SSH)

Protocol used when executing commands after remotely logging in to the server using encryption techniques

### JavaScript Object Notation (JSON)

Lightweight text-based open standard format designed for the exchange of data that can be read by humans

### Coordinate node

A node that receives requests such as indexing and searches from outside the coordinate node, delivers them to the data node, and receives and returns the request results

### Kibana

Visualization plugin of open-source data for Elasticsearch

### Primary Shard

Sections of blocks that have been broken and divided from a single data into multiple databases

          Note

          

To see a full list of terms and definitions, go to [Glossary](https://www.ncloud.com/guideCenter/glossary) from the NAVER Cloud Platform portal.