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sympy__sympy-15609

This is a different issue (15308 about Trace). The issue I'm working on is 15595 about MatrixElement indices. The problem is clear from the hints - _print_MatrixElement needs to call self._print on the indices.

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This is a different issue (15308 about Trace). The issue I'm working on is 15595 about MatrixElement indices. The problem is clear from the hints - `_print_MatrixElement` needs to call `self._print` on the indices.

Let me understand what the correct fix should be. The issue is:
- Current code: `'_{%s, %s}' % (expr.i, expr.j)` - this directly converts indices to strings
- Should be: `'_{%s, %s}' % (self._print(expr.i), self._print(expr.j))` - this properly prints indices through the LaTeX printer

When indices are `Dummy` symbols (like `i_1` from summations), they get represented as `_i_1` in 

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