Updated DEVELOPER GUIDE

Signed-off-by: Owais Kazi <[email protected]>

.github/CODEOWNERS

@@ -1,2 +1,3 @@
 # This should match the owning team set up in https://github.com/orgs/opensearch-project/teams
-*   @opensearch-project/opensearch-core
+*   @opensearch-project/opensearch-core
+

.linelint.yml

@@ -4,13 +4,14 @@ autofix: true
 ignore:
   - .git/
   - .gradle/
+  - .idea/
   - '*.sha1'
   - '*.txt'
   - '.github/CODEOWNERS'
   - 'buildSrc/src/testKit/opensearch.build/LICENSE'
   - 'buildSrc/src/testKit/opensearch.build/NOTICE'
   - 'server/licenses/apache-log4j-extras-DEPENDENCIES'
-  #Empty files
+  # Empty files
   - 'doc-tools/missing-doclet/bin/main/org/opensearch/missingdoclet/MissingDoclet.class'
   - 'buildSrc/src/integTest/resources/org/opensearch/gradle/internal/fake_git/remote/build.gradle'
   - 'buildSrc/src/integTest/resources/org/opensearch/gradle/internal/fake_git/remote/distribution/archives/oss-darwin-tar/build.gradle'
@@ -21,6 +22,7 @@ ignore:
   - 'buildSrc/src/testKit/opensearch.build/settings.gradle'
   - 'buildSrc/src/testKit/reaper/settings.gradle'
   - 'buildSrc/src/testKit/symbolic-link-preserving-tar/settings.gradle'
+  - 'buildSrc/src/testKit/testingConventions/empty_test_task/.gitignore'
   - 'client/rest-high-level/src/main/resources/META-INF/services/org.opensearch.plugins.spi.NamedXContentProvider'
   - 'distribution/bwc/bugfix/build.gradle'
   - 'distribution/bwc/maintenance/build.gradle'

DEVELOPER_GUIDE.md

@@ -48,6 +48,7 @@
     - [Distributed Framework](#distributed-framework)
   - [Submitting Changes](#submitting-changes)
   - [Backports](#backports)
+  - [LineLint](#linelint)
 
 # Developer Guide
 
@@ -472,3 +473,18 @@ See [CONTRIBUTING](CONTRIBUTING.md).
 ## Backports
 
 The Github workflow in [`backport.yml`](.github/workflows/backport.yml) creates backport PRs automatically when the original PR with an appropriate label `backport <backport-branch-name>` is merged to main with the backport workflow run successfully on the PR. For example, if a PR on main needs to be backported to `1.x` branch, add a label `backport 1.x` to the PR and make sure the backport workflow runs on the PR along with other checks. Once this PR is merged to main, the workflow will create a backport PR to the `1.x` branch.
+
+## LineLint
+A linter in [`new-line.yml`](.github/workflows/new-line.yml) that validates simple newline and whitespace rules in all sorts of files. It can:
+- Recursively check a directory tree for files that do not end in a newline
+- Automatically fix these files by adding a newline or trimming extra newlines.
+
+Rules are defined in `.linelint.yml`.
+
+Executing the binary will automatically search the local directory tree for linting errors.
+
+    linelint .
+
+Pass a list of files or directories to limit your search.
+
+    linelint README.md LICENSE