Automated snippet conversion by scripts

These changes are purely mechanical to differentiate them from manual
fixes/adjustments made in the next commit.
This results in broken code as some snippets contain errors.

Made in four steps:
1. Run ./migrate-snippet.py that converts `.md` files to code files
   and perhaps adds missing lines under `// @hide` comments.
2. Sort Java imports.
3. Remove old `.md` files.
4. Run ./generate.md to produce `*/generated/*.md` files.

qdrant-landing/content/documentation/headless/snippets/query-points/by-existing-id-with-lookup/csharp.cs

@@ -0,0 +1,19 @@
+using Qdrant.Client;
+
+public class Snippet
+{
+	public static async Task Run()
+	{
+		var client = new QdrantClient("localhost", 6334);
+
+		await client.QueryAsync(
+		  collectionName: "{collection_name}",
+		  query: Guid.Parse("43cf51e2-8777-4f52-bc74-c2cbde0c8b04"), // <--- point id
+		  usingVector: "512d-vector",
+		  lookupFrom: new() {
+		    CollectionName = "another_collection", // <--- other collection name
+		      VectorName = "image-512" // <--- vector name in the other collection
+		  }
+		);
+	}
+}

qdrant-landing/content/documentation/headless/snippets/query-points/by-existing-id-with-lookup/go.go

@@ -0,0 +1,24 @@
+package snippet
+
+import (
+	"context"
+
+	"github.com/qdrant/go-client/qdrant"
+)
+
+func Main() {
+	client, err := qdrant.NewClient(&qdrant.Config{
+		Host: "localhost",
+		Port: 6334,
+	})
+
+	client.Query(context.Background(), &qdrant.QueryPoints{
+		CollectionName: "{collection_name}",
+		Query:          qdrant.NewQueryID(qdrant.NewID("43cf51e2-8777-4f52-bc74-c2cbde0c8b04")),
+		Using:          qdrant.PtrOf("512d-vector"),
+		LookupFrom: &qdrant.LookupLocation{
+			CollectionName: "another_collection",
+			VectorName:     qdrant.PtrOf("image-512"),
+		},
+	})
+}

qdrant-landing/content/documentation/headless/snippets/query-points/by-existing-id-with-lookup/java.java

@@ -0,0 +1,30 @@
+package com.example.snippets_amalgamation;
+
+import static io.qdrant.client.QueryFactory.nearest;
+
+import io.qdrant.client.QdrantClient;
+import io.qdrant.client.QdrantGrpcClient;
+import io.qdrant.client.grpc.Points.LookupLocation;
+import io.qdrant.client.grpc.Points.QueryPoints;
+import java.util.UUID;
+
+public class Snippet {
+        public static void run() throws Exception {
+                QdrantClient client =
+                    new QdrantClient(QdrantGrpcClient.newBuilder("localhost", 6334, false).build());
+
+                client
+                    .queryAsync(
+                        QueryPoints.newBuilder()
+                            .setCollectionName("{collection_name}")
+                            .setQuery(nearest(UUID.fromString("43cf51e2-8777-4f52-bc74-c2cbde0c8b04")))
+                            .setUsing("512d-vector")
+                            .setLookupFrom(
+                                LookupLocation.newBuilder()
+                                    .setCollectionName("another_collection")
+                                    .setVectorName("image-512")
+                                    .build())
+                            .build())
+                    .get();
+        }
+}

qdrant-landing/content/documentation/headless/snippets/query-points/by-existing-id-with-lookup/python.py

@@ -0,0 +1,13 @@
+from qdrant_client import QdrantClient, models
+
+client = QdrantClient(url="http://localhost:6333")
+
+client.query_points(
+    collection_name="{collection_name}",
+    query="43cf51e2-8777-4f52-bc74-c2cbde0c8b04",  # <--- point id
+    using="512d-vector",
+    lookup_from=models.LookupLocation(
+        collection="another_collection",  # <--- other collection name
+        vector="image-512",  # <--- vector name in the other collection
+    )
+)

qdrant-landing/content/documentation/headless/snippets/query-points/by-existing-id-with-lookup/rust.rs

@@ -0,0 +1,18 @@
+use qdrant_client::Qdrant;
+use qdrant_client::qdrant::{LookupLocationBuilder, PointId, Query, QueryPointsBuilder};
+
+pub async fn main() -> anyhow::Result<()> {
+    let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+    client.query(
+        QueryPointsBuilder::new("{collection_name}")
+            .query(Query::new_nearest("43cf51e2-8777-4f52-bc74-c2cbde0c8b04"))
+            .using("512d-vector")
+            .lookup_from(
+                LookupLocationBuilder::new("another_collection")
+                    .vector_name("image-512")
+            )
+    ).await?;
+
+    Ok(())
+}

qdrant-landing/content/documentation/headless/snippets/query-points/by-existing-id-with-lookup/typescript.ts

@@ -0,0 +1,12 @@
+import { QdrantClient } from "@qdrant/js-client-rest";
+
+const client = new QdrantClient({ host: "localhost", port: 6333 });
+
+client.query("{collection_name}", {
+    query: '43cf51e2-8777-4f52-bc74-c2cbde0c8b04', // <--- point id
+    using: '512d-vector',
+    lookup_from: {
+        collection: 'another_collection', // <--- other collection name
+        vector: 'image-512', // <--- vector name in the other collection
+    }
+});