When Lucene throws on an overly complex regex in the ESQL regex logic, we return that error directly to the user as a 5xx class error. This should be a 4xx class user ...

java.lang.ArrayIndexOutOfBoundsException: Index 120 out of bounds for length 113 at java.base/jdk.internal.util.Preconditions$2.apply(Preconditions.java:63) at java ...