[v1.38] HFresh GA docs

[g-despot]

Documents the HFresh vector index for its v1.38 GA and surfaces it as a low-memory alternative to HNSW.

• Mark HFresh as generally available (status note updated to "Added in v1.36")
• Expand the HFresh concept, config-ref, and starter-guide pages with how it works (in-memory compressed centroids, on-disk postings), when to use it, and a recall tuning tip
• Correct the HFresh parameter table, including maxPostingSizeKB mutability
• Cross-reference HFresh as a memory-efficient option wherever the docs discuss HNSW memory cost, quantization for memory savings, or index choice

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[Copilot]

Pull request overview

Updates Weaviate documentation to reflect the HFresh vector index being generally available in v1.38 and positions it as a low-memory, disk-backed alternative to HNSW for very large datasets.

Changes:

• Expands HFresh explanations and adds recall-tuning guidance (searchProbe, rescoreLimit) in starter guides and index reference docs.
• Cross-links HFresh from memory/quantization/index-choice sections to help readers discover it when optimizing RAM usage.
• Updates the HFresh feature note/status include to remove “Preview” language and present it as “Added in v1.36”.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/weaviate/starter-guides/managing-resources/indexing.mdx	Expands HFresh overview and adds a tuning tip for recall.
docs/weaviate/starter-guides/managing-resources/compression.mdx	Adds HFresh as an index-level alternative when RAM is the main constraint.
docs/weaviate/config-refs/indexing/vector-index.mdx	Updates HFresh parameter table (mutability/details) and adds HFresh tuning guidance.
docs/weaviate/concepts/vector-quantization.md	Cross-references HFresh as a disk-backed alternative to compression for memory limits.
docs/weaviate/concepts/resources.md	Adds HFresh as an option for very large, memory-constrained datasets.
docs/weaviate/concepts/indexing/vector-index.md	Expands HFresh “how it works” + tradeoffs and updates the index comparison table.
docs/weaviate/concepts/filtering.md	Notes that HFresh benefits from ACORN via its centroid HNSW routing.
docs/weaviate/concepts/cluster.md	Mentions HFresh can reduce the need to shard purely for RAM reasons.
docs/weaviate/best-practices/index.md	Adds HFresh as an alternative to quantization for lowering memory footprint.
_includes/feature-notes/hfresh_status.mdx	Updates the feature status note to indicate availability since v1.36.

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