1. Elasticsearch：
Elasticsearch是一个分布式搜索和分析引擎。它是开源的，可用于所有类型的数据。它以Java编程语言实现，并支持具有Java虚拟机(JVM)的所有操作系统。它是Elastic Stack的主要组件，Elastic Stack是用于数据分析和可视化的开源应用程序。它具有高可伸缩性，并且执行动作的速度也很高，这使其成为用于数据分析，处理和可视化的便捷工具。
2. MongoDB：
MongoDB是面向文档的数据库模型，是一个开源软件。它是由MongoDB Inc.在2009年开发的。它是用C++语言实现的。 MongoDB使用JSON之类的文档。它可以用作独立程序，并提供备份功能。它具有很高的排名，并且在数据库中非常受欢迎。它还由用户定义的Java脚本功能组成。在MongoDB中，扩展是通过使用分片水平进行的。
IBM DB2和MongoDB之间的区别：
| S.NO. | Elasticsearch | MongoDB | |||
|---|---|---|---|---|---|
| 1. | Elasticsearch is a search and analytics engine based on Apache Lucene. | MongoDB is a document oriented database model. | |||
| 2. | The primary database model is a search engine. | Primary database model is document store in MongoDB. | |||
| 3. | It has no concept of transactions. | It has concept of transactions satisfying ACID properties . | |||
| 4. | It was developed by ELASTIC in 2010. | It was developed by MongoDB Inc. in 2009. | |||
| 5. | It has SQL like query language. | It uses MongoDB connector by BI for queries. | |||
| 6. | It involves eventual consistency. | It involves immediate consistency. | |||
| 7. | It is implemented in java. | It is implemented in C++ language. | |||
| 8. | It has Java API, RESTful HTTP/JSON API. | It has proprietary protocol using JSON. | |||
| 9. | It is considered less than MongoDB in terms of ranking. | It is considered better than Elasticsearch in terms of ranking. | 10. | It accepts all operating systems having JVM. | It supports LINUX, OS X, Solaris, Windows. |