Revert "Emulate sqlite FTS"

This reverts commit 2820c4b.

chromadb/segment/impl/metadata/sqlite.py

@@ -571,6 +571,7 @@ def _where_doc_criterion(
             elif k == "$contains":
                 v = cast(str, v)
                 search_term = f"%{v}%"
+
                 sq = (
                     self._db.querybuilder()
                     .from_(fulltext_t)

rust/worker/Cargo.toml

@@ -51,7 +51,6 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 opentelemetry = { version = "0.19.0", default-features = false, features = ["trace", "rt-tokio"] }
 opentelemetry-otlp = "0.12.0"
 shuttle = "0.7.1"
-regex = "1.10.5"
 
 
 [dev-dependencies]

rust/worker/src/execution/operators/metadata_filtering.rs

@@ -19,7 +19,6 @@ use crate::{
 };
 use core::panic;
 use futures::stream::Count;
-use regex::Regex;
 use roaring::RoaringBitmap;
 use std::{
     collections::{HashMap, HashSet},
@@ -523,10 +522,7 @@ impl Operator<MetadataFilteringInput, MetadataFilteringOutput> for MetadataFilte
                         }
                         match record.merged_document_ref() {
                             Some(doc) => {
-                                // Replace all occurences of _ and % with . in query.
-                                let normalized_query = query.replace("_", ".").replace("%", ".");
-                                let re = Regex::new(normalized_query.as_str()).unwrap();
-                                if re.is_match(doc) {
+                                if doc.contains(query) {
                                     matching_contains.push(record.offset_id as i32);
                                 }
                             }