This guide walks you through the process of creating a "hello world" Elasticsearch web service with Spring.
Install and launch Elasticsearch
Before you install the Elasticsearch, please check your Java version first by running (and then install/upgrade accordingly if needed):
java -version
echo $JAVA_HOME
Elasticsearch requires at least Java 8. You can download Java 8 from the Oracle's website.
This guide is work on Linux or Mac OS X system. You download the Elasticsearch with tar as follows:
curl -L -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.4.0.tar.gz
Then extract it as follows:
tar -xvf elasticsearch-6.4.0.tar.gz
It will then create a bunch of files and folders in your current directory. You then go into the bin directory as follows:
cd elasticsearch-6.4.0/bin
And now you are ready to start node and single cluster:
./elasticsearch
The elasticsearch http server is started on port 9200. You can run the command below with curl into a terminal.
curl -X GET "localhost:9200/_cat/health?v"
And the response:
| epoch | timestamp | cluster | status | node.total | node.data | shards | pri | relo | init | unassign | pending_tasks | max_task_wait_time | active_shards_percent |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1475247709 | 17:01:49 | elasticsearch | green | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | - | 100% |
Looking for more detail, you can find on Elasticsearch website.
This project is based on Gradle. So you can run the application from the command line with Gradle. Or you can build a single executable JAR file that contains all the necessary dependencise, classes, and resources, and run that.
Using Gradle, you can run the application using ./gradlew bootRun. Or you can build the JAR file using ./gradlew build. Then you can run the jar file:
java -jar build/libs/gs-spring-elasticsearch-0.1.0.jar
Note: Assume you already install mongo, and hava news data in it.
visit http://localhost:8081/api/v1.0/news/list, where you can see a news list.
visit http://localhost:8081/api/v1.0/news/detail?id=***, where you can see a news detail. when you visit the url, it meanwhile inserts a news record in Elasticsearch storage.
So, visit http://localhost:8081/api/v1.0/es/news/all, where you can see a news list in Elasticsearch.
You can find more REATful API in this project.