DA-1334 update: tutorial with the terminology of the search index

[VirajAgarwal1]

Update the tutorial for the correct terminology for the vector indexes.

[gemini-code-assist]

Summary of Changes

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This pull request focuses on enhancing the accuracy and consistency of a Node.js LangChain PDF chat tutorial by updating its terminology. The changes primarily involve replacing outdated references to 'Full-Text Search' (FTS) with the more current and precise 'Vector Search' and 'Search Service' terminology, ensuring the tutorial aligns with the latest product naming conventions and improves clarity for users.

Highlights

• Terminology Update: Replaced 'fts' with 'vector search' in tutorial metadata and updated related tags to 'Search Vector Index' for improved clarity.
• Documentation Link Corrections: Updated several internal links pointing to 'fts-introduction.html' to the more general 'search/search.html' and 'fts-creating-index-from-REST-dynamic.html' to 'search/create-search-index-rest-api.html'.
• Environment Variable Renaming: Modified the description for the INDEX_NAME environment variable from name_of_fts_index_with_vector_support to name_of_search_index_with_vector_support.

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[gemini-code-assist]

Code Review

This pull request updates the terminology in the Node.js LangChain PDF chat tutorial, replacing outdated 'FTS' references with the current 'Search' and 'Vector Search' terms. The changes are accurate and improve the tutorial's clarity. I have one minor suggestion to refine the tags for better consistency.