We can improve our stackframes in exceptions to help with debuggability, errors, hot threads, whatever.

• Give painless the name of the script (stored scripts: the id, file scripts: the filename, inline: null) at compile-time.
• Reduce length of generated class name.
• For inline scripts, we have no "filename" but we include some of the script to help identify it, but truncating with ellipsis if its too big or spans multiple lines.
• Add line number debug information to bytecode. It was added to AST nodes in Make Line Number Available in Painless #18298. We emit this for all leaf S-nodes.

example:

java.lang.NullPointerException
    at org.elasticsearch.painless.Executable$Script.execute(String x = null; boolean y = x.isEmpty(); ... @ <inline script>:1)