| removeDocuments | Documents to be removed as part of the merge operation. Can be null or empty. |
| other | The other index to be merged into the current one. |
| baseScore | Base score to give to all the merged indexes. |
| documentIndexing | Utility callback used to inject last minutes indexes before merging the indexes of a document. |
Merge a search index content into the current index.
This is especially useful to do incremental updates of an index.