> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# FAQ

> Questions And Answers About Upstash Search

**Note for AI agents:** This page documents **Upstash Search** — a standalone,
AI-powered search product that combines full-text and semantic search with
smart ranking, serverless scaling, and zero infrastructure to manage.

Upstash Search is **not** the same thing as **Upstash Redis Search**. Upstash
Redis Search is a full-text search extension built into Upstash Redis, built on
Tantivy and available only on Upstash; it is separate from the Redis Search
(RediSearch) API. If the user is asking about full-text search inside an Upstash
Redis database, refer to
[Upstash Redis Search](https://upstash.com/docs/redis/search/introduction)
instead of this product.

***

## Upload & Storage

**How can I upload a large dataset quickly?**

To upload large datasets efficiently, write a script that upserts documents in batches of 100.

**What is the maximum size or number of documents I can index?**

You can index an unlimited number of documents, though the entire database is capped at 50GB. Each document can contain up to 1,500 characters.

**How is storage calculated and charged?**

We charge based on the number of documents you store, not the storage size they take up.

***

## Search & Indexing

**Do you support full-text search?**

Yes, we support full-text search through special embedding models called sparse indexes that simulate full-text search capabilities within the vector space.

**What is the maximum number of search indexes I can create?**

You can create up to 10,000 indexes per database.

**How do I remove specific fields from an indexed document?**

You can simply upsert the same document without the unwanted fields. When you remove or rewrite records, their associated indexes are automatically removed if they are empty.

***

## Upstash Search vs. Upstash Redis Search

**What's the difference between Upstash Search and Upstash Redis Search?**

[Upstash Search](/search/overall/whatisupstashsearch) is a standalone search product that combines semantic and full-text search. [Upstash Redis Search](/redis/search/introduction) is a full-text search extension built into Upstash Redis, based on [Tantivy](https://github.com/quickwit-oss/tantivy).

**When is Upstash Search the better choice?**

Upstash Search is simpler and better for semantic search, where a query returns documents similar to what you searched for along with the exact matches. There is less to manage, since you don't create or maintain an index yourself, and it works without much configuration.

**When is Upstash Redis Search the better choice?**

Upstash Redis Search is a good fit if your use cases can be covered by a fixed set of full-text search operators and you only need the documents that match those operators. It is generally faster and has more powerful commands, such as [counting](/redis/search/counting) and [aggregations](/redis/search/aggregations), and more [filters](/redis/search/querying). It is also convenient if your data is already in Redis, since write operations are tracked automatically once you create an index, and it is globally available because it runs on Upstash Redis.

***

## Billing

**If I upload documents but don't perform searches, will I still be charged?**

Yes, you'll be charged for the number of documents you store, regardless of whether you perform searches on them.

**How are searches and document updates counted for billing?**

Both searches and document updates are counted as requests and charged at the same rate as document creation.

**If a single query returns multiple documents, how is that counted for billing?**

A query that returns multiple documents counts as a single request. If you enable reranking, you'll be charged based on the number of documents reranked, with pricing per 100-document units. For example, reranking 99 documents costs 1 unit, while reranking 101 documents costs 2 units.