skywalking: `NoSuchFileException: ../es_keystore.jks` when helm install skywalking with exist elasticsearch7

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• Bug
• Requirement
• Feature or performance improvement

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Question

• What do you want to know? what is the es_keystore.jks ? how to get es_keystore.jks ? fix the error: NoSuchFileException: ../es_keystore.jks

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Bug

• Which version of SkyWalking, OS and JRE? Helm charts: v2.0.0 Elasticsearch: 7.4.0

• Which company or project? skywalking-kubernetes

• What happen?

2020-04-07 06:08:40,297 - org.apache.skywalking.oap.server.library.module.BootstrapFlow -9512 [main] INFO  [] - start the provider default in alarm module.
2020-04-07 06:08:40,297 - org.apache.skywalking.oap.server.library.module.BootstrapFlow -9512 [main] INFO  [] - start the provider elasticsearch7 in storage module.
2020-04-07 06:08:40,298 - org.apache.skywalking.oap.server.library.client.elasticsearch.ElasticSearchClient -9513 [main] INFO  [] - elasticsearch cluster nodes: es-cn-vasdfakgkcvkafasfow09.public.elasticsearch.aliyuncs.com:9200
2020-04-07 06:08:40,321 - org.apache.skywalking.oap.server.starter.OAPServerBootstrap -9536 [main] ERROR [] - ../es_keystore.jks
org.apache.skywalking.oap.server.library.module.ModuleStartException: ../es_keystore.jks
        at org.apache.skywalking.oap.server.storage.plugin.elasticsearch7.StorageModuleElasticsearch7Provider.start(StorageModuleElasticsearch7Provider.java:224) ~[storage-elasticsearch7-plugin-7.0.0.jar:7.0.0]
        at org.apache.skywalking.oap.server.library.module.BootstrapFlow.start(BootstrapFlow.java:58) ~[library-module-7.0.0.jar:7.0.0]
        at org.apache.skywalking.oap.server.library.module.ModuleManager.init(ModuleManager.java:69) ~[library-module-7.0.0.jar:7.0.0]
        at org.apache.skywalking.oap.server.starter.OAPServerBootstrap.start(OAPServerBootstrap.java:43) [server-bootstrap-7.0.0.jar:7.0.0]
        at org.apache.skywalking.oap.server.starter.OAPServerStartUp.main(OAPServerStartUp.java:27) [server-starter-es7-7.0.0.jar:7.0.0]
Caused by: java.nio.file.NoSuchFileException: ../es_keystore.jks
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86) ~[?:1.8.0_212]
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) ~[?:1.8.0_212]
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107) ~[?:1.8.0_212]
        at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214) ~[?:1.8.0_212]
        at java.nio.file.Files.newByteChannel(Files.java:361) ~[?:1.8.0_212]
        at java.nio.file.Files.newByteChannel(Files.java:407) ~[?:1.8.0_212]
        at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) ~[?:1.8.0_212]
        at java.nio.file.Files.newInputStream(Files.java:152) ~[?:1.8.0_212]
        at org.apache.skywalking.oap.server.library.client.elasticsearch.ElasticSearchClient.createClient(ElasticSearchClient.java:151) ~[library-client-7.0.0.jar:7.0.0]
        at org.apache.skywalking.oap.server.storage.plugin.elasticsearch7.client.ElasticSearch7Client.connect(ElasticSearch7Client.java:95) ~[storage-elasticsearch7-plugin-7.0.0.jar:7.0.0]
        at org.apache.skywalking.oap.server.storage.plugin.elasticsearch7.StorageModuleElasticsearch7Provider.start(StorageModuleElasticsearch7Provider.java:216) ~[storage-elasticsearch7-plugin-7.0.0.jar:7.0.0]
        ... 4 more

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Requirement or improvement

fix the error: NoSuchFileException: ../es_keystore.jks