ESQL: TO_LOWER process all values (elastic#124676)

Make `TO_LOWER` and `TO_UPPER` process all values it received.

This is quite large because it borrows a lot of code from the regular
evaluator generator to generate conversions so we can use the Locale.
That change propagates to the order of some parameters and to the
`toString` and a few more places.

Closes elastic#124002

Author: nik9000

docs/changelog/124676.yaml

@@ -0,0 +1,6 @@
+pr: 124676
+summary: TO_LOWER processes all values
+area: ES|QL
+type: bug
+issues:
+ - 124002

docs/reference/esql/functions/examples/to_lower.asciidoc

@@ -1399,6 +1399,20 @@ emp_no:integer  | first_name:keyword    | name_lower:keyword
 ;
 
 
+toLowerMv
+required_capability: to_lower_mv
+// tag::to_lower_mv[]
+ROW v = TO_LOWER(["Some", "Text"])
+// end::to_lower_mv[]
+;
+
+// tag::to_lower_mv-result[]
+   v:keyword
+["some", "text"]
+// end::to_lower_mv-result[]
+;
+
+
 toUpperRow#[skip:-8.12.99]
 // tag::to_upper[]
 ROW message = "Some Text"
@@ -1421,6 +1435,20 @@ emp_no:integer  | first_name:keyword    | name_upper:keyword
 ;
 
 
+toUpperMv
+required_capability: to_lower_mv
+// tag::to_upper_mv[]
+ROW v = TO_UPPER(["Some", "Text"])
+// end::to_upper_mv[]
+;
+
+// tag::to_upper_mv-result[]
+   v:keyword
+["SOME", "TEXT"]
+// end::to_upper_mv-result[]
+;
+
+
 toUpperLowerUnicode#[skip:-8.12.99]
 row a = "π/2 + a + B + Λ ºC" | eval lower = to_lower(a), upper = to_upper(a) | keep a, upper, lower;
 

docs/reference/esql/functions/kibana/definition/to_lower.json

@@ -838,7 +838,12 @@ public enum Cap {
          * During resolution (pre-analysis) we have to consider that joins or enriches can override EVALuated values
          * https://github.com/elastic/elasticsearch/issues/126419
          */
-        FIX_JOIN_MASKING_EVAL;
+        FIX_JOIN_MASKING_EVAL,
+
+        /**
+         * Do {@code TO_LOWER} and {@code TO_UPPER} process all field values?
+         */
+        TO_LOWER_MV;
 
         private final boolean enabled;
 

docs/reference/esql/functions/kibana/definition/to_upper.json

@@ -14,6 +14,7 @@
 import org.elasticsearch.compute.data.Vector;
 import org.elasticsearch.compute.operator.DriverContext;
 import org.elasticsearch.compute.operator.EvalOperator;
+import org.elasticsearch.core.Releasables;
 import org.elasticsearch.xpack.esql.core.tree.Source;
 
 import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.aggregateMetricDoubleBlockToString;
@@ -63,7 +64,7 @@ public Block evalBlock(Block b) {
 
     @Override
     public void close() {
-        field.close();
+        Releasables.closeExpectNoException(field);
     }
 
     public static class Factory implements EvalOperator.ExpressionEvaluator.Factory {