Split off the values supplier for ScriptDocValues (#80635)

This change makes all ScriptDocValues purely a wrapper around a supplier. (Similar to what 
FieldValues was.) However, there are some important differences:

* This is meant to be transitory. As more DocValuesFields are completed, more of the simple 
suppliers (ones that aren't DocValuesFields) can be removed.
* ScriptDocValues is the wrapper rather than the supplier. DocValuesFields are eventually the target 
suppliers which makes it really easy to remove the simple suppliers once they are no longer 
necessary.
* ScriptDocValues can be easily deprecated and removed without having to move their code to 
DocValuesFields. Once ScriptDocValues is removed we can remove the supplier code from 
DocValuesFields.
* DelegateDocValuesField ensures that any ScriptDocValues field are not supplied by another 
DocValuesField with an assert statement. This helps us to identify bugs during testing.
* ScriptDocValues no longer have setNextDocId. This helps us identify bugs during compilation.
* Conversions will not share/wrap suppliers since the suppliers are transitory.

modules/mapper-extras/src/main/java/org/elasticsearch/index/mapper/extras/ScaledFloatFieldMapper.java

@@ -26,6 +26,7 @@
 import org.elasticsearch.index.fielddata.LeafNumericFieldData;
 import org.elasticsearch.index.fielddata.NumericDoubleValues;
 import org.elasticsearch.index.fielddata.ScriptDocValues.Doubles;
+import org.elasticsearch.index.fielddata.ScriptDocValues.DoublesSupplier;
 import org.elasticsearch.index.fielddata.SortedBinaryDocValues;
 import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
 import org.elasticsearch.index.fielddata.plain.SortedNumericIndexFieldData;
@@ -269,7 +270,7 @@ public IndexFieldData.Builder fielddataBuilder(String fullyQualifiedIndexName, S
                 return new ScaledFloatIndexFieldData(
                     scaledValues,
                     scalingFactor,
-                    (dv, n) -> new DelegateDocValuesField(new Doubles(dv), n)
+                    (dv, n) -> new DelegateDocValuesField(new Doubles(new DoublesSupplier(dv)), n)
                 );
             };
         }

plugins/mapper-murmur3/src/main/java/org/elasticsearch/index/mapper/murmur3/Murmur3FieldMapper.java

@@ -19,6 +19,7 @@
 import org.elasticsearch.index.fielddata.IndexFieldData;
 import org.elasticsearch.index.fielddata.IndexNumericFieldData.NumericType;
 import org.elasticsearch.index.fielddata.ScriptDocValues.Longs;
+import org.elasticsearch.index.fielddata.ScriptDocValues.LongsSupplier;
 import org.elasticsearch.index.fielddata.plain.SortedNumericIndexFieldData;
 import org.elasticsearch.index.mapper.DocumentParserContext;
 import org.elasticsearch.index.mapper.FieldMapper;
@@ -83,7 +84,10 @@ public Murmur3FieldMapper build(MapperBuilderContext context) {
     // this only exists so a check can be done to match the field type to using murmur3 hashing...
     public static class Murmur3FieldType extends MappedFieldType {
 
-        public static final ToScriptField<SortedNumericDocValues> TO_SCRIPT_FIELD = (dv, n) -> new DelegateDocValuesField(new Longs(dv), n);
+        public static final ToScriptField<SortedNumericDocValues> TO_SCRIPT_FIELD = (dv, n) -> new DelegateDocValuesField(
+            new Longs(new LongsSupplier(dv)),
+            n
+        );
 
         private Murmur3FieldType(String name, boolean isStored, Map<String, String> meta) {
             super(name, false, isStored, true, TextSearchInfo.NONE, meta);

server/src/main/java/org/elasticsearch/index/fielddata/IpScriptFieldData.java

@@ -14,6 +14,8 @@
 import org.elasticsearch.common.bytes.BytesArray;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.network.InetAddresses;
+import org.elasticsearch.index.fielddata.ScriptDocValues.Strings;
+import org.elasticsearch.index.fielddata.ScriptDocValues.StringsSupplier;
 import org.elasticsearch.index.mapper.IpFieldMapper;
 import org.elasticsearch.indices.breaker.CircuitBreakerService;
 import org.elasticsearch.script.IpFieldScript;
@@ -53,7 +55,7 @@ public BinaryScriptLeafFieldData loadDirect(LeafReaderContext context) throws Ex
         return new BinaryScriptLeafFieldData() {
             @Override
             public DocValuesField<?> getScriptField(String name) {
-                return new DelegateDocValuesField(new IpScriptDocValues(getBytesValues()), name);
+                return new DelegateDocValuesField(new Strings(new IpSupplier(getBytesValues())), name);
             }
 
             @Override
@@ -69,18 +71,19 @@ public ValuesSourceType getValuesSourceType() {
     }
 
     /**
-     * Doc values implementation for ips. We can't share
+     * Doc values supplier implementation for ips. We can't share
      * {@link IpFieldMapper.IpFieldType.IpScriptDocValues} because it is based
      * on global ordinals and we don't have those.
      */
-    public static class IpScriptDocValues extends ScriptDocValues.Strings {
-        public IpScriptDocValues(SortedBinaryDocValues in) {
+    public static class IpSupplier extends StringsSupplier {
+
+        public IpSupplier(SortedBinaryDocValues in) {
             super(in);
         }
 
         @Override
-        protected String bytesToString(BytesRef bytes) {
-            InetAddress addr = InetAddressPoint.decode(BytesReference.toBytes(new BytesArray(bytes)));
+        protected String bytesToString(BytesRef bytesRef) {
+            InetAddress addr = InetAddressPoint.decode(BytesReference.toBytes(new BytesArray(bytesRef)));
             return InetAddresses.toAddrString(addr);
         }
     }