add two lang example

Author: rustagir

source/examples/atlas-examples/TwoLanguagesQuery.kt

@@ -0,0 +1,64 @@
+import com.mongodb.client.model.Aggregates.project
+import com.mongodb.client.model.Projections.*
+import com.mongodb.kotlin.client.coroutine.MongoClient
+import kotlinx.coroutines.runBlocking
+import org.bson.Document
+import java.time.Instant
+import java.util.*
+
+fun main() {
+    val uri = "<connection string>"
+    val mongoClient = MongoClient.create(uri)
+    
+    val database = mongoClient.getDatabase("sample_mflix")
+    val collection = database.getCollection<Document>("movies")
+
+    runBlocking {
+        val mustClauses = listOf(
+            Document(
+                "text",
+                Document("path", Document("value", "fullplot")
+                    .append("multi", "fullplot_english"))
+                    .append("query", "Bella")
+            )
+        )
+
+        val mustNotClauses = listOf(
+            Document(
+                "range", Document("path", "released")
+                    .append("gt", Date.from(Instant.parse("1984-01-01T00:00:00.000Z")))
+                    .append("lt", Date.from(Instant.parse("2016-01-01T00:00:00.000Z")))
+            )
+        )
+
+        val shouldClauses = listOf(
+            Document(
+                "text",
+                Document("query", "Comedy")
+                    .append("path", "genres")
+            )
+        )
+
+        val agg = Document(
+            "\$search", Document( "index", "multilingual-tutorial")
+            .append("compound",
+                Document().append("must", mustClauses)
+                    .append("mustNot", mustNotClauses)
+                    .append("should", shouldClauses)
+            )
+        )
+
+        val resultsFlow = collection.aggregate<Document>(
+            listOf(
+                agg,
+                project(fields(
+                    excludeId(),
+                    include("title", "fullplot", "released", "genres"),
+                    computed("score", Document("\$meta", "searchScore"))
+                ))
+            )
+        )
+        resultsFlow.collect { println(it) }
+    }
+    mongoClient.close()
+}