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/create-payload-index/stemmer-full-text/csharp.cs

@@ -0,0 +1,30 @@
+using Qdrant.Client;
+using Qdrant.Client.Grpc;
+
+public class Snippet
+{
+	public static async Task Run()
+	{
+		var client = new QdrantClient("localhost", 6334);
+
+		await client.CreatePayloadIndexAsync(
+			collectionName: "{collection_name}",
+			fieldName: "name_of_the_field_to_index",
+			schemaType: PayloadSchemaType.Text,
+			indexParams: new PayloadIndexParams
+			{
+				TextIndexParams = new TextIndexParams
+				{
+					Tokenizer = TokenizerType.Word,
+					Stemmer = new StemmingAlgorithm
+					{
+						Snowball = new SnowballParams
+						{
+							Language = "english"
+						}
+					}
+				}
+			}
+		);
+	}
+}

qdrant-landing/content/documentation/headless/snippets/create-payload-index/stemmer-full-text/go.go

@@ -0,0 +1,27 @@
+package snippet
+
+import (
+    "context"
+
+    "github.com/qdrant/go-client/qdrant"
+)
+
+func Main() {
+	client, err := qdrant.NewClient(&qdrant.Config{
+	    Host: "localhost",
+	    Port: 6334,
+	})
+
+	client.CreateFieldIndex(context.Background(), &qdrant.CreateFieldIndexCollection{
+		CollectionName: "{collection_name}",
+		FieldName:      "name_of_the_field_to_index",
+		FieldType:      qdrant.FieldType_FieldTypeText.Enum(),
+		FieldIndexParams: qdrant.NewPayloadIndexParamsText(
+			&qdrant.TextIndexParams{
+				Tokenizer: qdrant.TokenizerType_Word,
+				Stemmer: qdrant.NewStemmingAlgorithmSnowball(&qdrant.SnowballParams{
+					Language: "english",
+				}),
+			}),
+	})
+}

qdrant-landing/content/documentation/headless/snippets/create-payload-index/stemmer-full-text/java.java

@@ -0,0 +1,38 @@
+package com.example.snippets_amalgamation;
+
+import io.qdrant.client.QdrantClient;
+import io.qdrant.client.QdrantGrpcClient;
+import io.qdrant.client.grpc.Collections.PayloadIndexParams;
+import io.qdrant.client.grpc.Collections.PayloadSchemaType;
+import io.qdrant.client.grpc.Collections.SnowballParams;
+import io.qdrant.client.grpc.Collections.StemmingAlgorithm;
+import io.qdrant.client.grpc.Collections.TextIndexParams;
+import io.qdrant.client.grpc.Collections.TokenizerType;
+
+public class Snippet {
+        public static void run() throws Exception {
+                QdrantClient client =
+                    new QdrantClient(QdrantGrpcClient.newBuilder("localhost", 6334, false).build());
+
+                client
+                    .createPayloadIndexAsync(
+                        "{collection_name}",
+                        "name_of_the_field_to_index",
+                        PayloadSchemaType.Text,
+                        PayloadIndexParams.newBuilder()
+                            .setTextIndexParams(
+                                TextIndexParams.newBuilder()
+                                    .setTokenizer(TokenizerType.Word)
+                                    .setStemmer(
+                                        StemmingAlgorithm.newBuilder()
+                                            .setSnowball(
+                                                SnowballParams.newBuilder().setLanguage("english").build())
+                                            .build())
+                                    .build())
+                            .build(),
+                        true,
+                        null,
+                        null)
+                    .get();
+        }
+}

qdrant-landing/content/documentation/headless/snippets/create-payload-index/stemmer-full-text/python.py

@@ -0,0 +1,16 @@
+from qdrant_client import QdrantClient, models
+
+client = QdrantClient(url="http://localhost:6333")
+
+client.create_payload_index(
+    collection_name="{collection_name}",
+    field_name="name_of_the_field_to_index",
+    field_schema=models.TextIndexParams(
+        type="text",
+        tokenizer=models.TokenizerType.WORD,
+        stemmer=models.SnowballParams(
+            type=models.Snowball.SNOWBALL,
+            language=models.SnowballLanguage.ENGLISH
+        )
+    ),
+)

qdrant-landing/content/documentation/headless/snippets/create-payload-index/stemmer-full-text/rust.rs

@@ -0,0 +1,26 @@
+use qdrant_client::qdrant::{
+    CreateFieldIndexCollectionBuilder,
+    TextIndexParamsBuilder,
+    FieldType,
+    TokenizerType,
+};
+use qdrant_client::Qdrant;
+
+pub async fn main() -> anyhow::Result<()> {
+    let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+    let text_index_params = TextIndexParamsBuilder::new(TokenizerType::Word)
+        .snowball_stemmer("english".to_string());
+
+    client
+        .create_field_index(
+            CreateFieldIndexCollectionBuilder::new(
+                "{collection_name}",
+                "{field_name}",
+                FieldType::Text,
+            ).field_index_params(text_index_params.build()),
+        )
+        .await?;
+
+    Ok(())
+}

qdrant-landing/content/documentation/headless/snippets/create-payload-index/stemmer-full-text/typescript.ts

@@ -0,0 +1,15 @@
+import { QdrantClient } from "@qdrant/js-client-rest";
+
+const client = new QdrantClient({ host: "localhost", port: 6333 });
+
+client.createPayloadIndex("{collection_name}", {
+  field_name: "name_of_the_field_to_index",
+  field_schema: {
+    type: "text",
+    tokenizer: "word",
+    stemmer: {
+      type: "snowball",
+      language: "english"
+    }
+  }
+});