Exact matches are separated by [...] in highlights

[Soliine]

Is your feature request related to a problem? Please describe.
It's misleading when you search for "bureau d'imposition" for instance and in the results' highlights, they are sometimes separated by [...] while they are separated only by a space in the original document.

Describe the solution you'd like
It'd be better not to see [...] when the searched terms are separated only by a space.

[annelhote]

It seems it is an issue of ES. We can't use the fvh highlighter because our documents are not indexed with the term_vector type. We could increase the fragment size as a workaround but it won't solve the issue.