Elastic search list all the nodes in a cluster

There are two ways to list all the nodes in an Elasticsearch cluster:

1. Using the _cat/nodes API:

This API is intended for human consumption using the command line or Kibana console. To use it, you can run the following command:

curl -XGET 'http://localhost:9200/_cat/nodes'

This will return a list of all the nodes in the cluster, along with information such as their IP address, role, and status.

2. Using the nodes info API:

This API is intended for application consumption. To use it, you can run the following command:

curl -XGET 'http://localhost:9200/_nodes/info'

This will return a more detailed list of all the nodes in the cluster, including information such as their configuration, JVM information, and operating system information.

You can also use the nodes info API to list specific nodes in the cluster by passing their IDs to the API. For example, to list the nodes with the IDs node-1 and node-2, you can run the following command:

curl -XGET 'http://localhost:9200/_nodes/info/node-1,node-2'

Whichever method you choose, you can use the output of the API to get a better understanding of the nodes in your Elasticsearch cluster. This information can be useful for troubleshooting problems, monitoring performance, and scaling your cluster.

is it necesarry to include java version in pom?

It is not necessary to include the Java version in the POM, but it is a good practice to do so. This is because it can help to ensure that the project is built and run with the correct version of Java.

If you do not include the Java version in the POM, Maven will use the Java version that is installed on the system where the project is being built. This can be problematic if you are working on a team where everyone has a different version of Java installed.

Another reason to include the Java version in the POM is that it can help to document the project's requirements. This can be useful for other developers who are working on the project, or for people who are trying to deploy the project to a production environment.

To include the Java version in the POM, you can add the following property to the <properties> section of the POM:

XML

<properties>
  <maven.compiler.source>17</maven.compiler.source>
  <maven.compiler.target>17</maven.compiler.target>
</properties>

This will tell Maven to compile the project with Java 17. You can also set the maven.compiler.release property to specify the minimum version of Java that is required to run the project.

Overall, it is a good practice to include the Java version in the POM. This can help to ensure that the project is built and run with the correct version of Java, and it can also help to document the project's requirements.

Additional benefits of including the Java version in the POM:

• It can help to avoid compatibility issues between different versions of Java.
• It can help to ensure that the project is built with the latest features and bug fixes.
• It can help to make the project more reproducible and portable.

Conclusion

Whether or not to include the Java version in the POM is a matter of personal preference. However, it is a good practice to do so, as it can provide a number of benefits.