USE 346 - --skip-embeddings flag for reindex-source

[ghukill]

Purpose and background context

Why these changes are being introduced:

There might be times we want to re-index a source to Opensearch without indexing embeddings as a secondary pass.

How this addresses that need:

Add --skip-embeddings flag to reindex-source CLI command.

How can a reviewer manually see the effects of these changes?

1- Set Dev1 credentials

2- Re-index libguides to Dev1, without embeddings:

TIMDEX_OPENSEARCH_ENDPOINT=search-timdex-dev-fgby3dckzlfmni2len2wbdf444.us-east-1.es.amazonaws.com \
pipenv run tim reindex-source \
--skip-embeddings \
-s libguides \
s3://timdex-extract-dev-222053980223/dataset

Note log line:

2026-01-30 11:42:22,123 INFO tim.cli.reindex_source(): Skipping embeddings update.

Includes new or updated dependencies?

NO

Changes expectations for external applications?

NO

What are the relevant tickets?

• https://mitlibraries.atlassian.net/browse/USE-346
  • inspired by analysis work required in this ticket

Code review

• Code review best practices are documented here and you are encouraged to have a constructive dialogue with your reviewers about their preferences and expectations.

[ehanson8]

Simple and works as expected!