docs: v0.2 search index (#21619)

docs/docusaurus.config.js

@@ -124,7 +124,7 @@ const config = {
     /** @type {import('@docusaurus/preset-classic').ThemeConfig} */
     ({
       announcementBar: {
-        content: 'You are viewing the <strong>preview</strong> LangChain v0.2 docs. Note that 0.2 Search features are currently unstable and in progress. View the <a href="/v0.1/docs/get_started/introduction/">stable 0.1 docs here</a>.',
+        content: 'You are viewing the <strong>preview</strong> LangChain v0.2 docs. View the <a href="/v0.1/docs/get_started/introduction/">stable 0.1 docs here</a>.',
         isCloseable: true,
       },
       docs: {
@@ -310,7 +310,7 @@ const config = {
         // this is linked to erick@langchain.dev currently
         apiKey: "6c01842d6a88772ed2236b9c85806441",
 
-        indexName: "python-langchain",
+        indexName: "python-langchain-0.2",
 
         contextualSearch: true,
       },