這裡記錄一下elasticsearch2.1.0索引的相關的操作，程式碼都是自己經過測試可以直接使用的程式碼。

/**
 * es索引相關操作測試類
 * @author yujie.wang
 */
public class IndexOperator {

	private static String INDEX = "my_store";
	private static String TYPE = "products";

	
	/**
	 * 判斷一個索引是否存在
	 * @param client
	 * @param index
	 */
	public void isExists(IndicesAdminClient client,String index){
		IndicesExistsResponse response = client.prepareExists(index).get();
		System.out.println(response.isExists() ? "exists" : "no");
		// another mthod
/*		IndicesExistsRequest request = new IndicesExistsRequest(index);
		IndicesExistsResponse response2 = indexClient.exists(request).actionGet();
		System.out.println(response2.isExists() ? "exists": " no");*/
	}
	
	/**
	 * 判斷一個索引的型別是否存在
	 * @param client
	 * @param index
	 * @param type
	 */
	public void isTypeExists(IndicesAdminClient client , String index, String type){
		TypesExistsResponse response = client.prepareTypesExists(index).setTypes(type).get();
		System.out.println(response.isExists() ? " type exists": " no");
	}
	
	/**
	 * 建立一個索引
	 * @param client
	 * @param index
	 */
	public void createIndex(IndicesAdminClient client , String index){
		CreateIndexResponse response = client.prepareCreate(index).get();
		System.out.println(response.isAcknowledged() ? " create successfully": " create failed");
	}
/*	{
		"state": "open",
		"settings": {
		"index": {
		"creation_date": "1513589566589",
		"uuid": "d8C9DP04QdW9BUD2M6JBLg",
		"number_of_replicas": "1",
		"number_of_shards": "5",
		"version": {
		"created": "2010099"
		}
		}
		},
		"mappings": { },
		"aliases": [ ]
		}*/
	
	/**
	 * 指定setting和mapping資訊建立索引
	 * @param client
	 * @param index
	 * @param type
	 */
	public void createIndexBySettingAndMapping(IndicesAdminClient client , String index,String type){
		Settings settings = Settings.builder().put("index.number_of_shards", 3).put("index.number_of_replicas", 2).build();
		XContentBuilder mapping = null;
		try {
			mapping = XContentFactory.jsonBuilder()
					.startObject()
						.startObject(type)
							.startObject("properties")
							 .startObject("name").field("type", "string").field("store", "yes").endObject()
	                         .startObject("sex").field("type", "string").field("store", "yes").endObject()
	                         .startObject("college").field("type", "string").field("store", "yes").endObject()
	                         .startObject("age").field("type", "integer").field("store", "yes").endObject()
	                         .startObject("school").field("type", "string").field("store", "yes").field("index", "not_analyzed").endObject()
	                     .endObject()
	                 .endObject()
	             .endObject();
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("exception: "+e);
		}
		CreateIndexResponse response = client.prepareCreate(index).setSettings(settings).addMapping(type, mapping).get();
		System.out.println(response.isAcknowledged() ? " create successfully": " create failed");
	}

	/*{
		"state": "open",
		"settings": {
		"index": {
		"creation_date": "1513592594874",
		"uuid": "d0R_IzukQSC8pXT7JkPpxA",
		"number_of_replicas": "2",
		"number_of_shards": "3",
		"version": {
		"created": "2010099"
		}
		}
		},
		"mappings": {
		"yujie_type": {
		"properties": {
		"sex": {
		"store": true,
		"type": "string"
		},
		"school": {
		"index": "not_analyzed",
		"store": true,
		"type": "string"
		},
		"name": {
		"store": true,
		"type": "string"
		},
		"age": {
		"store": true,
		"type": "integer"
		},
		"college": {
		"store": true,
		"type": "string"
		}
		}
		}
		},
		"aliases": [ ]
		}*/
	
	/**
	 * 刪除索引
	 * @param client
	 * @param index
	 */
	public void deleteIndex(IndicesAdminClient client , String index){
		DeleteIndexResponse response = client.prepareDelete(index).get();
		System.out.println(response.isAcknowledged() ? " delete successfully": " delete failed");
	}
	
	/**
	 * 當索引不再使用時 可以關閉索引
	 * @param client
	 * @param index
	 */
	public void closeIndex(IndicesAdminClient client , String index){
		CloseIndexResponse response = client.prepareClose(index).get();
		System.out.println(response.isAcknowledged() ? " delete successfully": " delete failed");
	}
	
	/**
	 * 開啟一個關閉的索引
	 * @param client
	 * @param index
	 */
	public void openIndex(IndicesAdminClient client , String index){
		OpenIndexResponse response = client.prepareOpen(index).get();
		System.out.println(response.isAcknowledged() ? " delete successfully": " delete failed");
	}
	
	
	/**
	 * 索引存在的情況下 為索引新增一個mapping
	 * @param client
	 * @param index
	 * @param type
	 */
	public void putMappingByIndex(IndicesAdminClient client , String index, String type){
		 XContentBuilder mappingBuilder = null;
		    try {
		        mappingBuilder = XContentFactory.jsonBuilder()
		                .startObject()
		                    .startObject(type)
		                        .startObject("properties")
		                            .startObject("name").field("type", "string").field("store", "yes").endObject()
		                            .startObject("sex").field("type", "string").field("store", "yes").endObject()
		                            .startObject("college").field("type", "string").field("store", "yes").endObject()
		                            .startObject("age").field("type", "long").field("store", "yes").endObject()
		                            .startObject("school").field("type", "string").field("store", "yes").field("index", "not_analyzed").endObject()
		                        .endObject()
		                    .endObject()
		                .endObject();
		    } catch (Exception e) {
		    	System.out.println("exception: "+ e);
		    }
		    PutMappingResponse response = client.preparePutMapping(index).setType(type).setSource(mappingBuilder).get();
		    System.out.println(response.isAcknowledged() ? " delete successfully": " delete failed");
	}
	
	/**
	 * 給一個索引設定別名
	 * @param client
	 * @param index
	 */
	public void addAlias(IndicesAdminClient client , String index, String alias){
		IndicesAliasesResponse response = client.prepareAliases().addAlias(index, alias).get();
		System.out.println(response.isAcknowledged() ? " add successfully": " add failed");
	}
	
	/**
	 * 判斷一個別名是否存在
	 * @param client
	 * @param index
	 * @param alias
	 */
	public void isAliasesExist(IndicesAdminClient client , String index, String alias){
		AliasesExistResponse response = client.prepareAliasesExist(alias).get();
		System.out.println(response.exists() ? " alias exists": "  alias not exists");
	}
	
	/**
	 * 更新索引的分片資訊，只能更新分片副本資訊，主分片一旦分配就不能改變
	 * @param client
	 * @param index
	 */
	public void updateIndexSetting(IndicesAdminClient client , String index){
		Settings settings = Settings.builder().put("index.number_of_replicas", 1).build();
		UpdateSettingsResponse response = client.prepareUpdateSettings(index).setSettings(settings).get();
		System.out.println(response.isAcknowledged() ? " update successfully": " update failed");
	}
	
}