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https://github.com/hakdogan/elasticsearch
:globe_with_meridians: This application illustrates and demonstrates use of ElasticSearch Java API in the backend
https://github.com/hakdogan/elasticsearch
elasticsearch elasticsearch-java-api rest-client
Last synced: about 8 hours ago
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:globe_with_meridians: This application illustrates and demonstrates use of ElasticSearch Java API in the backend
- Host: GitHub
- URL: https://github.com/hakdogan/elasticsearch
- Owner: hakdogan
- Created: 2013-08-18T22:49:09.000Z (about 11 years ago)
- Default Branch: master
- Last Pushed: 2023-12-17T18:11:51.000Z (11 months ago)
- Last Synced: 2024-04-16T18:52:40.723Z (7 months ago)
- Topics: elasticsearch, elasticsearch-java-api, rest-client
- Language: Java
- Homepage:
- Size: 4.23 MB
- Stars: 114
- Watchers: 21
- Forks: 87
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
A demonstration of how to use Elasticsearch Java API
===================================================
This repository demonstrates the use of Elasticsearch Java API via `Java High Level REST Client`. If you want to see the sample of the old version, please visit the [oldVersion](https://github.com/hakdogan/ElasticSearch/tree/oldVersion) branch.
## What you will learn in this repository?
* How to use Java High Level REST Client
* How to perform Administration operations
* Index creation
* Mapping settings
* How to perform CRUD operations
### Initialization Java High Level REST Client
```java
@Bean(destroyMethod = "close")
public RestHighLevelClient getRestClient() {
return new RestHighLevelClient(RestClient.builder(new HttpHost(props.getClients().getHostname(),
props.getClients().getHttpPort(), props.getClients().getScheme())));
}
```
### Index creation and Shard, Replica settings with Java High Level REST Client
```java
final GetIndexRequest request = new GetIndexRequest(props.getIndex().getName());
final boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
if (!exists) {
final CreateIndexRequest indexRequest = new CreateIndexRequest(props.getIndex().getName());
indexRequest.settings(Settings.builder()
.put("index.number_of_shards", props.getIndex().getShard())
.put("index.number_of_replicas", props.getIndex().getReplica())
);
final CreateIndexResponse createIndexResponse = client.indices().create(indexRequest, RequestOptions.DEFAULT);
if (createIndexResponse.isAcknowledged() && createIndexResponse.isShardsAcknowledged()) {
log.info("{} index created successfully", props.getIndex().getName());
} else {
log.debug("Failed to create {} index", props.getIndex().getName());
}
}
```
### Mapping Settings
```java
final PutMappingRequest mappingRequest = new PutMappingRequest(props.getIndex().getName());
final XContentBuilder builder = XContentFactory.jsonBuilder();
builder.startObject();
...
builder.endObject();
mappingRequest.source(builder);
final AcknowledgedResponse putMappingResponse = client.indices().putMapping(mappingRequest, RequestOptions.DEFAULT);
if (putMappingResponse.isAcknowledged()) {
log.info("Mapping of {} was successfully created", props.getIndex().getName());
} else {
log.debug("Creating mapping of {} failed", props.getIndex().getName());
}
```
### Using SearchSourceBuilder and showing search results
```java
sourceBuilder.query(builder);
SearchRequest searchRequest = getSearchRequest();
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = searchResponse.getHits();
SearchHit[] searchHits = hits.getHits();
for (SearchHit hit : searchHits) {
Document doc = gson.fromJson(hit.getSourceAsString(), Document.class);
doc.setId(hit.getId());
result.add(doc);
}
```
### Using Query String with Wildcard
```java
result = getDocuments(QueryBuilders.queryStringQuery("*" + query.toLowerCase() + "*"));
```
### Document deletion
```
final DeleteRequest deleteRequest = new DeleteRequest(props.getIndex().getName(), id);
client.delete(deleteRequest, RequestOptions.DEFAULT);
```
## How to compile?
```
mvn clean install
```
The docker-maven-plugin needs Docker daemon, if you don't have it you should use `-Dmaven.test.skip=true -Ddocker.skip` parameters.
## How to run?
```
mvn spring-boot:run
```
With this option, you should provide an `elasticsearch server`.
## How to run with Docker?
```
sh run.sh
```
With this option, this application and an `elasticsearch server` run together.
