Spring boot “使用tcp端口”；9300“；在application.properties文件中，但仍然得到；所有配置的节点都不可用；

错误：

版本：

Spring引导版本：2.1.6和Elasticsearch版本：7.3.0

这是我的elasticsearch.yml文件：

failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{uyXiOMnyRpyTSXqUoNxTyg}{localhost}{127.0.0.1:9300}]

这是我的application.properties文件：

# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#       Before you set out to tweak and tune the configuration, make sure you
#       understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
cluster.name: elastic
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
#node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
path.data: D:\JEE_Projects\spring\Spring_WorkSpace\spring-boot-with-mongodb
#
# Path to log files:
#
#path.logs: /path/to/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
#network.host: 192.168.0.1
#
# Set a custom port for HTTP:
# http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.seed_hosts: ["host1", "host2"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
#cluster.initial_master_nodes: ["node-1", "node-2"]
#
# For more information, consult the discovery and cluster formation module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

我重新启动了应用程序，重新启动了elasticsearch.bat，甚至重新启动了整个电脑，但一切都不正常

---

此外，我还以为其他一些应用程序会占用这个端口，但它被elasticsearch本身占用了。（我在浏览器中键入“localhost:9300”，它的响应是“这不是HTTP端口”）。

我猜“cluster name=elastic”可能是错误的。您确定elastic使用这样的群集名称运行吗？

我问了这个问题，我找到了解决方案

有两个主要的内部问题：

在Elasticsearch的最新版本（从7.x开始，我猜）中，每个索引只能有一个“类型”（虽然不赞成在索引中有多个“类型”，但我们仍然可以强制使用它）。我通过@Document annotation为每个实体指定了不同的“类型”，但在相同的索引下

我下载了Elasticsearch的最新版本，即7.3.0。由于它是一项新兴技术，因此更新非常频繁。但是在spring中，默认情况下，Elasticsearch jar的版本是6.4.3（您可以通过单击Maven依赖项看到这一点）

解决方案：

---

对于第一个问题，可以为每个实体创建单独的索引。要解决第二个问题，您可以将Elasticsearch的版本降级到6.4.3，也可以将Maven依赖项中的jar版本升级到7.3.0（但在7.3.0 jar中，一些内置方法有些不同，您可能不知道）。

不，这不是问题所在。事实上，我发现了错误（总共3个错误），并将自己回答这个问题。但我现在有点忙。我很快就会写出解决方案。顺便说一下，谢谢你给我时间回答这个问题。你好@Dario，我已经添加了答案。看一看。

#Local MongoDB config
spring.data.mongodb.uri=mongodb://localhost:27017/newtest


# App config
server.port=8080
spring.application.name=BootMongo
server.address=localhost

# elastic search

spring.data.elasticsearch.cluster-name=elastic

#spring.main.allow-bean-definition-overriding=true

#spring.data.elasticsearch.repositories.enabled = true
spring.data.elasticsearch.cluster-nodes =localhost:9300