SQL Plugin Issue SQLNumberExpr cannot be cast to SQLIdentifierExpr

We have an issue with the SQL Plugin. The plugin worked in a single server cluster, but in a multiple node cluster it did not.

POST _opendistro/_sql?
{
“query”: “SELECT * FROM myindex LIMIT 50”
}

{
“error”: {
“reason”: “com.alibaba.druid.sql.ast.expr.SQLNumberExpr cannot be cast to com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr”,
“details”: “java.lang.ClassCastException: com.alibaba.druid.sql.ast.expr.SQLNumberExpr cannot be cast to com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr”,
“type”: “ClassCastException”
},
“status”: 503
}