[documentation] Adds documentation to help fix local Lucene code erro…

…rs (#928) (#931)

* Adds documentation to help fix local Lucene code errors

Signed-off-by: Brian Flores <iflorbri@amazon.com>
(cherry picked from commit a77ccac)

Co-authored-by: Brian Flores <iflorbri@amazon.com>

DEVELOPER_GUIDE.md

@@ -11,10 +11,12 @@
     - [Run Single-node Cluster Locally](#run-single-node-cluster-locally)
     - [Run Multi-node Cluster Locally](#run-multi-node-cluster-locally)
   - [Debugging](#debugging)
+    - [Major Dependencies](#major-dependencies)
   - [Backwards Compatibility Testing](#backwards-compatibility-testing)
     - [Adding new tests](#adding-new-tests)
   - [Supported configurations](#supported-configurations)
   - [Submitting Changes](#submitting-changes)
+  - [Building On Lucene Version Updates](#building-on-lucene-version-updates)
 
 # Developer Guide
 
@@ -88,12 +90,22 @@ Please follow these formatting guidelines:
 OpenSearch neural-search uses a [Gradle](https://docs.gradle.org/6.6.1/userguide/userguide.html) wrapper for its build.
 Run `gradlew` on Unix systems.
 
-Build OpenSearch neural-search using `gradlew build`
+Build OpenSearch neural-search using `gradlew build`. This command will
+also run Integration Tests and Unit Tests.
 
 ```
 ./gradlew build
 ```
 
+## Run Unit Tests
+If you want to strictly test that your unit tests are passing
+you can run the following.
+
+```
+./gradlew test
+```
+
+
 ## Run OpenSearch neural-search
 
 ### Run Single-node Cluster Locally
@@ -227,6 +239,12 @@ Additionally, it is possible to attach one debugger to the cluster JVM and anoth
 ./gradlew :integTest -Dtest.debug=1 -Dcluster.debug=1
 ```
 
+#### Major Dependencies
+Currently, the major dependencies that Neural Search depends on are [ML-Commons](https://github.com/opensearch-project/ml-commons) and [K-NN](https://github.com/opensearch-project/k-NN).
+Make sure to check on them when you observe a failure that affects Neural Search.
+See [Building on Lucene Version updates](#building-on-lucene-version-updates) as an example where K-NN caused a build failure.
+Also, please note that it may take time for developers to create a fix for your current dependency issue.
+
 ## Backwards Compatibility Testing
 
 The purpose of Backwards Compatibility Testing and different types of BWC tests are explained [here](https://github.com/opensearch-project/opensearch-plugins/blob/main/TESTING.md#backwards-compatibility-testing). The BWC tests (i.e. Restart-Upgrade, Mixed-Cluster and Rolling-Upgrade scenarios) should be added with any new feature being added to Neural Search.
@@ -292,3 +310,31 @@ original PR with an appropriate label `backport <backport-branch-name>` is merge
 run successfully on the PR. For example, if a PR on main needs to be backported to `2.x` branch, add a label
 `backport 2.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 `2.x` branch.
+
+## Building On Lucene Version Updates
+There may be a Lucene version update that can affect your workflow causing errors like
+`java.lang.NoClassDefFoundError: org/apache/lucene/codecs/lucene99/Lucene99Codec` or 
+`Provider org.opensearch.knn.index.codec.KNN910Codec.KNN910Codec could not be instantiated`. In this case
+we can observe there may be an issue with a dependency with [K-NN](https://github.com/opensearch-project/k-NN).
+This results in having issues with not being able to do `./gradlew run` or `./gradlew build`.
+
+You can check this [K-NN PR](https://github.com/opensearch-project/k-NN/pull/2195) as an example of this event happening or this [Neural Search PR](https://github.com/opensearch-project/neural-search/pull/913#issuecomment-2400189329) that shows a developer going
+through the same build issue.
+
+**Follow the steps to remedy the gradle run issue.**
+1. From your cloned neural search repo root directory `rm -rf build .gradle`
+2. Clear the following directories from your gradle folder located in your root directory
+   1. `cd ~/.gradle`
+   2. `rm -rf caches workers wrapper daemon`
+   3. `cd -` switch back the previous directory (i.e. the neural search repo root directory)
+3. Finally run `./gradlew run`
+
+**Follow the steps to remedy the gradle build issue**
+
+**PREREQ:** Make sure you have OpenSearch repo cloned locally
+
+1. From your cloned neural search repo root directory `rm -rf build .gradle`
+2. Delete the .gradle folder and .m2 folder. `rm -rf ~/.gradle ~/.m2`
+3. Head over to your OpenSearch cloned repo root directory
+   1. `./gradlew publisToMavenLocal`
+4. Finally run `./gradlew build` from the neural search repo