snapshot（持续更新中）
首先先了解一下官网中提到的如何backup your elasticsearchhttps://www.elastic.co/guide/en/elasticsearch/guide/current/backing-up-your-cluster.html
知识点
1.关于repository的几种类型。
（来自官网）To use this functionality, you must first create a repository to save data. There are several repository types that you may choose from:
[*]Shared filesystem, such as a NAS
[*]Amazon S3
[*]HDFS (Hadoop Distributed File System)
[*]Azure Cloud
下面截图是来自kopf这个插件，url在上面没有提到，其他的都能对上
总结一下：fs---->Shared filesystem
s3---->Amazon S3
hdfs--->HDFS (Hadoop Distributed File System)
azure--->Azure Cloud
下面是google的一篇不错的关于snapshot es的 java 代码。
https://dzone.com/articles/how-use-elasticsearch-snapshot
下面是我自己写的代码
String repositoryPath = "E:\\snapshot";
boolean compress = true;
String repositoryType = "fs";
// es 2.4
Settings setting = Settings.builder()
.put("location", repositoryPath)
.put("compress", compress).build();
PutRepositoryResponse putRepositoryResponse = clusterAdminClient.preparePutRepository(defaultRepositoryName)
.setType(repositoryType).setSettings(setting)
.execute().actionGet();
if (putRepositoryResponse.isAcknowledged()) {
System.out.println(defaultRepositoryName + " have been created");
repositoryMetaDataList = clusterAdminClient.prepareGetRepositories(defaultRepositoryName).get().repositories();
System.out.println(repositoryMetaDataList.size());
}
Exception in thread "main" RepositoryVerificationException[ ]; nested: RepositoryVerificationException[ a file written by master to the store cannot be accessed on the node [{node-hippo3}{VMYox38PS9qXN3hYhf588Q}{10.12.198.242}{10.12.198.242:9300}{master=true}]. This might indicate that the store is not shared between this node and the master node or that permissions on the store don't allow reading files written by the master node];'], ]; nested: RepositoryVerificationException[ a file written by master to the store cannot be accessed on the node [{node-hippo1}{EZQYXYKcTtuDCgjr17_M6g}{10.12.198.240}{10.12.198.240:9300}{master=false}]. This might indicate that the store is not shared between this node and the master node or that permissions on the store don't allow reading files written by the master node];']]]
at org.elasticsearch.repositories.RepositoriesService$VerifyingRegisterRepositoryListener$1.onResponse(RepositoriesService.java:440)
......
一开始我以为，这个repositoryPath应该是绝对路径，从报错看到设置的应该是相对路径（开头不能是/，直接输入文件夹名字就好了），那么绝对的文件夹位置在哪里设置的，google了一下，发现在elasticsearch.yml中有个变量path.repo，恍然大悟。。。
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