Use element indices `particle.ei` in curvilinear search #1434

Job	Run time
py3.12 \| ubuntu \| unit tests	5m 7s
py3.11 \| ubuntu \| unit tests	5m 2s
py${{ matrix.python-version }} \| ${{ matrix.os }} \| integration tests	0s
mypy	0s
merge-test-artifacts	0s
	10m 9s

Provide feedback