[ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [runTask-0] fatal error in thread [elasticsearch[runTask-0][search][T#1]], exiting java.lang.AssertionError
        at org.apache.lucene.core@10.2.1/org.apache.lucene.util.automaton.Automaton.getNumTransitions(Automaton.java:348)
        at org.apache.lucene.core@10.2.1/org.apache.lucene.util.automaton.Operations.getSingleton(Operations.java:1240)
        at org.elasticsearch.xpack.esql.core.expression.predicate.regex.AbstractStringPattern.exactMatch(AbstractStringPattern.java:35)
        at org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceRegexMatch.rule(ReplaceRegexMatch.java:44)
        at org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceRegexMatch.rule(ReplaceRegexMatch.java:20)
        at org.elasticsearch.xpack.esql.optimizer.rules.logical.OptimizerRules$OptimizerExpressionRule.lambda$apply$0(OptimizerRules.java:62)

{"index":{"_index":"test1","_id":1}}
{"test":"abc"}

{
    "query": {
        "regexp": {
            "test.keyword": {
                "value": "#",
                "flags": "ALL"
            }
        }
    }
}