Search fails for documents exceeding Elasticsearch highlighting limit

[tsmilan]

Global search fails when searching for documents that contain content fields exceeding Elasticsearch's highlighting limit (index.highlight.max_analyzed_offset). The default is 1 MB, but this varies by platform and configuration.

Steps to replicate:

1. Create a forum post with 3 MB+ of text in the description. For example, you can go to https://elementor.com/tools/lorem-ipsum-generator/ and generate 7,000 paragraphs (around 3.4 MB).
2. Execute the search indexer (core\task\search_index_task) to index the forum post.
3. Search for a keyword from that content via global search
4. Error is displayed instead of search results