add support for f64 for concat fields

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[github-actions]

On SSD:

Average search latency is 0.994x that of the reference (lower is better).
Ref run id: 3127, ref commit: c00dd57
Link

On GCS:

Average search latency is 0.984x that of the reference (lower is better).
Ref run id: 3128, ref commit: c00dd57
Link

[trinity-1686a]

you will also need something like

diff --git a/quickwit/quickwit-doc-mapper/src/default_doc_mapper/mapping_tree.rs b/quickwit/quickwit-doc-mapper/src/default_doc_mapper/mapping_tree.rs
index ec2faa76a..b93a08b2c 100644
--- a/quickwit/quickwit-doc-mapper/src/default_doc_mapper/mapping_tree.rs
+++ b/quickwit/quickwit-doc-mapper/src/default_doc_mapper/mapping_tree.rs
@@ -282,7 +282,10 @@ impl LeafType {
                 let val = u64::from_json_to_self(&json_val, numeric_options.coerce)?;
                 Ok(OneOrIter::one((val).into()))
             }
-            LeafType::F64(_) => Err("unsupported concat type: f64".to_string()),
+            LeafType::F64(numeric_options) => {
+                let val = f64::from_json_to_self(&json_val, numeric_options.coerce)?;
+                Ok(OneOrIter::one((val).into()))
+            },
             LeafType::Bool(_) => {
                 if let JsonValue::Bool(val) = json_val {
                     Ok(OneOrIter::one((val).into()))

otherwise the index can be created, but the values are not mapped