Big search queries cause 502

[jrcastro2]

Describe the bug
A big search query causes a 502.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Frontsite'
2. Write a really big query like "+optics -nano -laser -lasers -fiber -photonics -coherent -quantum -atmospheric -integrated -magneto -molded -nonlinear -electron -beam -lagrangian -fibre -x-ray -fourier -particles -electro -contemporary -inverse -semiconductor -particle -gradient -holography -polarimetry -black -probability -grating -Hubble -mobile -television -sky -antenna -interpolation -photography -waveguide -data -surface -world -underwater -mechanics -adaptive -nulling -graphene -microsystem -windows -maxwell -newton -heisenberg -eye -terahertz -nematicons -moon -AI -speckle -lenses -star -polar -electromagnetic -electrical -electronics -organic -Faraday -spectroscopy -sources -video"
3. HIt enter
4. See error

Expected behavior
Normal search should happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
If we try to do the same query using the API it works, https://catalogue.library.cern/api/literature/?q=%2Boptics%20-nano%20-laser%20-lasers%20-fiber%20-photonics%20-coherent%20-quantum%20-atmospheric%20-integrated%20-magneto%20-molded%20-nonlinear%20-electron%20-beam%20-lagrangian%20-fibre%20-x-ray%20-fourier%20-particles%20-electro%20-contemporary%20-inverse%20-semiconductor%20-particle%20-gradient%20-holography%20-polarimetry%20-black%20-probability%20-grating%20-Hubble%20-mobile%20-television%20-sky%20-antenna%20-interpolation%20-photography%20-waveguide%20-data%20-surface%20-world%20-underwater%20-mechanics%20-adaptive%20-nulling%20-graphene%20-microsystem%20-windows%20-maxwell%20-newton%20-heisenberg%20-eye%20-terahertz%20-nematicons%20-moon%20-AI%20-speckle%20-lenses%20-star%20-polar%20-electromagnetic%20-electrical%20-electronics%20-organic%20-Faraday%20-spectroscopy%20-sources%20-video&sort=bestmatch&page=1&size=60&medium=E-BOOK&language=ENG&language=DEU&doctype=BOOK