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For certain situations, end-users need the base path for Elasticsearch logs. Exposing this as a property is better than hard-coding the path into the logging configuration file as otherwise the logging configuration file could easily diverge from the Elasticsearch configuration file. Additionally, Elasticsearch will only have permissions to write to the log directory configured in the Elasticsearch configuration file. This commit adds a property that exposes this base path. One use-case for this is configuring a rollover strategy to retain logs for a certain period of time. As such, we add an example of this to the documentation. Additionally, we expose the property es.logs.cluster_name as this is used as the name of the log files in the default configuration. Finally, we expose es.logs.node_name in cases where node.name is explicitly set in case users want to include the node name as part of the name of the log files. Relates #22625
The Elasticsearch docs are in AsciiDoc format and can be built using the Elasticsearch documentation build process. See: https://github.com/elastic/docs Snippets marked with `// CONSOLE` are automatically annotated with "VIEW IN SENSE" in the documentation and are automatically tested by the command `gradle :docs:check`. To test just the docs from a single page, use e.g. `gradle :docs:check -Dtests.method=*rollover*`. By default `// CONSOLE` snippet runs as its own isolated test. You can manipulate the test execution in the following ways: * `// TEST`: Explicitly marks a snippet as a test. Snippets marked this way are tests even if they don't have `// CONSOLE`. * `// TEST[s/foo/bar/]`: Replace `foo` with `bar` in the test. This should be used sparingly because it makes the test "lie". Sometimes, though, you can use it to make the tests more clear. * `// TEST[catch:foo]`: Used to expect errors in the requests. Replace `foo` with `request` to expect a 400 error, for example. If the snippet contains multiple requests then only the last request will expect the error. * `// TEST[continued]`: Continue the test started in the last snippet. Between tests the nodes are cleaned: indexes are removed, etc. This will prevent that. This is really useful when you have text and snippets that work together to tell the story of some use case because it merges the snippets (and thus the use case) into one big test. * `// TEST[skip:reason]`: Skip this test. Replace `reason` with the actual reason to skip the test. Snippets without `// TEST` or `// CONSOLE` aren't considered tests anyway but this is useful for explicitly documenting the reason why the test shouldn't be run. * `// TEST[setup:name]`: Run some setup code before running the snippet. This is useful for creating and populating indexes used in the snippet. The setup code is defined in `docs/build.gradle`. * `// TEST[warning:some warning]`: Expect the response to include a `Warning` header. If the response doesn't include a `Warning` header with the exact text then the test fails. If the response includes `Warning` headers that aren't expected then the test fails. * `// TESTRESPONSE`: Matches this snippet against the body of the response of the last test. If the response is JSON then order is ignored. With `// TEST[continued]` you can make tests that contain multiple command snippets and multiple response snippets. * `// TESTRESPONSE[s/foo/bar/]`: Substitutions. See `// TEST[s/foo/bar]`. * `// TESTRESPONSE[_cat]`: Add substitutions for testing `_cat` responses. Use this after all other substitutions so it doesn't make other substitutions difficult. * `// TESTSETUP`: Marks this snippet as the "setup" for all other snippets in this file. This is a somewhat natural way of structuring documentation. You say "this is the data we use to explain this feature" then you add the snippet that you mark `// TESTSETUP` and then every snippet will turn into a test that runs the setup snippet first. See the "painless" docs for a file that puts this to good use. This is fairly similar to `// TEST[setup:name]` but rather than the setup defined in `docs/build.gradle` the setup is defined right in the documentation file. Any place you can use json you can use elements like `$body.path.to.thing` which is replaced on the fly with the contents of the thing at `path.to.thing` in the last response.