(DOCSP-29228): Kotlin indexes fundamentals page (#41)

# Pull Request Info

[PR Reviewing
Guidelines](https://github.com/mongodb/docs-java/blob/master/REVIEWING.md)

JIRA - https://jira.mongodb.org/browse/DOCSP-29228
Staging -
https://docs-mongodbcom-staging.corp.mongodb.com/kotlin/docsworker-xlarge/DOCSP-29228/fundamentals/indexes/

## Self-Review Checklist

- [ ] Is this free of any warnings or errors in the RST?
- [ ] Did you run a spell-check?
- [ ] Did you run a grammar-check?
- [ ] Are all the links working?

---------

Co-authored-by: Jeff Yemin <[email protected]>

Author: mongodben

examples/build.gradle.kts

@@ -23,7 +23,6 @@ dependencies {
     implementation("org.slf4j:slf4j-api:1.7.32")
     implementation("ch.qos.logback:logback-classic:1.2.6")
     implementation("io.github.cdimascio:dotenv-kotlin:6.4.1")
-    implementation("org.apache.logging.log4j:log4j-slf4j-impl:2.17.1")
     implementation("io.netty:netty-all:4.1.91.Final")
     implementation("io.netty:netty-tcnative-boringssl-static:2.0.53.Final:${osdetector.classifier}")
 }

examples/src/test/kotlin/ChangeTest.kt

@@ -11,9 +11,6 @@ import org.junit.jupiter.api.TestInstance
 import java.util.*
 import kotlin.test.*
 
-
-
-
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 internal class ChangeTest {
     // :snippet-start: data-model

examples/src/test/kotlin/DeleteTest.kt

@@ -1,3 +1,4 @@
+
 import com.mongodb.client.model.Filters
 import com.mongodb.client.model.Sorts.ascending
 import com.mongodb.kotlin.client.coroutine.MongoClient
@@ -12,16 +13,15 @@ import org.junit.jupiter.api.TestInstance
 import java.util.*
 import kotlin.test.*
 
-// :snippet-start: delete-data-model
-data class PaintOrder(
-    @BsonId val id: Int,
-    val qty: Int,
-    val color: String
-)
-// :snippet-end:
-
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 internal class DeleteTest {
+    // :snippet-start: delete-data-model
+    data class PaintOrder(
+        @BsonId val id: Int,
+        val qty: Int,
+        val color: String
+    )
+    // :snippet-end:
 
     companion object {
         val dotenv = dotenv()

examples/src/test/kotlin/IndexesTest.kt

@@ -0,0 +1,4 @@
+val clusteredIndexOptions = ClusteredIndexOptions(Document("_id", 1), true)
+val createCollectionOptions = CreateCollectionOptions().clusteredIndexOptions(clusteredIndexOptions)
+
+database.createCollection("vendors", createCollectionOptions)

source/examples/generated/IndexesTest.snippet.clustered-indexes.kt

@@ -0,0 +1,11 @@
+val filter = Filters.and(
+    Filters.eq(Movie::type.name, "movie"),
+    Filters.eq(Movie::rated.name, "G")
+)
+val sort = Sorts.ascending(Movie::type.name, Movie::rated.name)
+val projection = Projections.fields(
+    Projections.include(Movie::type.name, Movie::rated.name),
+    Projections.excludeId()
+)
+val resultsFlow = moviesCollection.find(filter).sort(sort).projection(projection)
+resultsFlow.collect { println(it) }

source/examples/generated/IndexesTest.snippet.compound-index-query.kt

@@ -0,0 +1,2 @@
+val resultCreateIndex = moviesCollection.createIndex(Indexes.ascending(Movie::type.name, Movie::rated.name))
+println("Index created: $resultCreateIndex")

source/examples/generated/IndexesTest.snippet.compound-index-setup.kt

@@ -0,0 +1,14 @@
+val resultCreateIndex = moviesCollection.createIndex(Indexes.ascending(Movie::type.name, Movie::rated.name))
+println("Index created: $resultCreateIndex")
+
+val filter = Filters.and(
+    Filters.eq(Movie::type.name, "movie"),
+    Filters.eq(Movie::rated.name, "G")
+)
+val sort = Sorts.ascending(Movie::type.name, Movie::rated.name)
+val projection = Projections.fields(
+    Projections.include(Movie::type.name, Movie::rated.name),
+    Projections.excludeId()
+)
+val resultsFlow = moviesCollection.find(filter).sort(sort).projection(projection)
+resultsFlow.collect { println(it) }

source/examples/generated/IndexesTest.snippet.compound-index.kt

@@ -0,0 +1,29 @@
+// Data class for the movies collection
+data class Movie(
+    val title: String,
+    val year: Int,
+    val cast: List<String>,
+    val genres: List<String>,
+    val type: String,
+    val rated: String,
+    val plot: String,
+    val fullplot: String,
+)
+
+// Data class for the theaters collection
+data class Theater(
+    val theaterId: Int,
+    val location: Location
+) {
+    data class Location(
+        val address: Address,
+        val geo: Point
+    ) {
+        data class Address(
+            val street1: String,
+            val city: String,
+            val state: String,
+            val zipcode: String
+        )
+    }
+}

source/examples/generated/IndexesTest.snippet.data-classes.kt

@@ -0,0 +1 @@
+moviesCollection.dropIndex("*")