Fix typo in code comments about Elasticsearch

What does this MR do?

Fixes typos in code comments about Elasticsearch, which were introduced in !15891 (merged) and !23553 (merged).

cf. docs fixes: !30162 (merged).

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• [n/a] Merge request performance guidelines
• [n/a] Style guides
• [n/a] Database guides
• Separation of EE specific content