Commits on Aug 17, 2021

1. Script: ulong via fields API (elastic#76519) …

   Exposes unsigned long via the fields API.
   
   Unsigned longs default to java signed longs.  That means the upper range
   appears negative.  Consumers should use `Long.compareUnsigned(long, long)`
   `Long.divideUnsigned(long, long)` and `Long.remainderUnsigned(long, long)`
   to correctly work with values known to be unsigned long.
   
   Alternatively, users may treat the unsigned long type as `BigInteger` using
   the field API, `field('ul').as(Field.BigInteger).getValue(BigInteger.ZERO)`.
   ```
   field('ul').as(Field.BigInteger).getValue(BigInteger.valueOf(1000))
   field('ul').getValue(1000L)
   ```
   
   This change also implements the beginning of the converters for the fields
   API.  The following conversions have been added:
   ```
   ulong <-> BigInteger
   long <-> BigInteger
   double -> BigInteger
   String (parsed as long or double) -> BigInteger
   double -> long
   String (parsed as long or double) -> long
   Date (epoch milliseconds) -> long
   Nano Date (epoch nanoseconds) -> long
   boolean (1L for true, 0L for false) -> long
   ```
   
   Backport: aea8bff

   

   stu-elastic committed Aug 17, 2021
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