Using Opensearch kNN in Java

[safakkbilici]

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
Java 17, Gradle 8.4, OpenSearch 2.15, OpenSearch kNN 2.15

Describe the issue:
Hi everyone, I want to use kNN plugin of OpenSearch in its Java client, however I am not able to use it. I added it as a dependency, it seems that I cannot even import it.

Configuration:
When I import a module in knn, like

import org.opensearch.knn.index.SpaceType;

the error is Cannot resolve symbol 'knn'.

Relevant Logs or Screenshots:
The library is shown in External Libraries but not able to import.

[safakkbilici]

For those experiencing the same issue, if you use Gradle, it downloads the library as a .zip file. While I am not entirely sure if this resolves the problem, adding unzipping modules seems to help:

configurations {
	knnZip
}

dependencies {
	knnZip 'org.opensearch.plugin:opensearch-knn:2.15.0.0@zip'
}

task unzipKnn(type: Copy) {
	from zipTree(configurations.knnZip.singleFile)
	into "$buildDir/libs/opensearch-knn"
}

tasks.named('build') {
	dependsOn 'unzipKnn'
}

sourceSets {
	main {
		runtimeClasspath += fileTree(dir: "$buildDir/libs/opensearch-knn", include: '**/*.jar')
	}
}

then clean build as ./gradlew clean build.

[safakkbilici]

So after a few trials, my solution does not seem to work for me I downloaded .jar file from maven and add it to my projects libs/path and then configured my gradle file as this

repositories {
    mavenCentral()
    flatDir {
        dirs 'libs'
    }
}

...

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
}

then clean build.