feat: allow explicit index builder uuid

rust/lancedb/src/index.rs

@@ -189,6 +189,7 @@ pub struct IndexBuilder {
     pub(crate) index: Index,
     pub(crate) columns: Vec<String>,
     pub(crate) replace: bool,
+    pub(crate) index_uuid: Option<uuid::Uuid>,
     pub(crate) wait_timeout: Option<Duration>,
     pub(crate) train: bool,
     pub(crate) name: Option<String>,
@@ -201,6 +202,7 @@ impl IndexBuilder {
             index,
             columns,
             replace: true,
+            index_uuid: None,
             train: true,
             wait_timeout: None,
             name: None,
@@ -217,6 +219,12 @@ impl IndexBuilder {
         self
     }
 
+    /// Use a caller-selected UUID for the created index.
+    pub fn index_uuid(mut self, uuid: uuid::Uuid) -> Self {
+        self.index_uuid = Some(uuid);
+        self
+    }
+
     /// The name of the index. If not set, a default name will be generated.
     ///
     /// # Examples

rust/lancedb/src/table/create_index.rs

@@ -156,6 +156,9 @@ impl NativeTable {
             .train(opts.train)
             .replace(opts.replace);
 
+        if let Some(index_uuid) = opts.index_uuid {
+            builder = builder.index_uuid(index_uuid);
+        }
         if let Some(name) = opts.name {
             builder = builder.name(name);
         }