Implement dumpless upgrade from v1.15 to v1.16

crates/milli/src/update/upgrade/v1_16.rs

@@ -0,0 +1,48 @@
+use heed::types::{SerdeJson, Str};
+use heed::RwTxn;
+
+use super::UpgradeIndex;
+use crate::progress::Progress;
+use crate::vector::db::{EmbedderInfo, EmbeddingStatus};
+use crate::{Index, InternalError, Result};
+
+#[allow(non_camel_case_types)]
+pub(super) struct Latest_V1_15_To_V1_16_0();
+
+impl UpgradeIndex for Latest_V1_15_To_V1_16_0 {
+    fn upgrade(
+        &self,
+        wtxn: &mut RwTxn,
+        index: &Index,
+        _original: (u32, u32, u32),
+        _progress: Progress,
+    ) -> Result<bool> {
+        let v1_15_indexing_configs = index
+            .main
+            .remap_types::<Str, SerdeJson<Vec<super::v1_15::IndexEmbeddingConfig>>>()
+            .get(wtxn, crate::index::main_key::EMBEDDING_CONFIGS)?
+            .unwrap_or_default();
+
+        let embedders = index.embedding_configs();
+        for config in v1_15_indexing_configs {
+            let embedder_id = embedders.embedder_id(wtxn, &config.name)?.ok_or(
+                InternalError::DatabaseMissingEntry {
+                    db_name: crate::index::db_name::VECTOR_EMBEDDER_CATEGORY_ID,
+                    key: None,
+                },
+            )?;
+            let info = EmbedderInfo {
+                embedder_id,
+                // v1.15 used not to make a difference between `user_provided` and `! regenerate`.
+                embedding_status: EmbeddingStatus::from_user_provided(config.user_provided),
+            };
+            embedders.put_embedder_info(wtxn, &config.name, &info)?;
+        }
+
+        Ok(false)
+    }
+
+    fn target_version(&self) -> (u32, u32, u32) {
+        (1, 16, 0)
+    }
+}