Method update

backend/src/git/index.rs:807–840

(
        &mut self,
        client: &Client,
        repo_id: RepoId,
        entry: &SearchEntry,
        before: &BTreeSet<Search>,
        after: &BTreeSet<Search>,
    )

    }

    pub fn update(
        &mut self,
        client: &Client,
        repo_id: RepoId,
        entry: &SearchEntry,
        before: &BTreeSet<Search>,
        after: &BTreeSet<Search>,
    ) -> Result<()> {
        let removed = before.difference(after);
        for search in removed {
            for token in &search.tokens {
                let key = repo_id.index_key(token)?;
                self.search_token_index(client, &key)?
                    .remove(entry, token.to_owned())?;
            }
        }

        let empty = BTreeSet::new();
        let before = match self.mode {
            IndexMode::Replace => &empty,
            _ => before,
        };

        let added = after.difference(before);
        for search in added {
            for token in &search.tokens {
                let key = repo_id.index_key(token)?;
                self.search_token_index(client, &key)?
                    .add(entry, token.to_owned())?;
            }
        }

        Ok(())
    }

    pub fn update_synonyms(
        &mut self,