corrected lefover copypasta comment and hints referring to mongodb (#…

…14392)

docs/docs/module_guides/loading/ingestion_pipeline/index.md

@@ -123,20 +123,21 @@ from llama_index.embeddings.openai import OpenAIEmbedding
 from llama_index.core.node_parser import SentenceSplitter
 from llama_index.core.extractors import TitleExtractor
 from llama_index.core.ingestion import IngestionPipeline, IngestionCache
-from llama_index.core.ingestion.cache import RedisCache
+from llama_index.storage.kvstore.redis import RedisKVStore as RedisCache
 
 
+ingest_cache = IngestionCache(
+    cache=RedisCache.from_host_and_port(host="127.0.0.1", port=6379),
+    collection="my_test_cache",
+)
+
 pipeline = IngestionPipeline(
     transformations=[
         SentenceSplitter(chunk_size=25, chunk_overlap=0),
         TitleExtractor(),
         OpenAIEmbedding(),
     ],
-    cache=IngestionCache(
-        cache=RedisCache(
-            redis_uri="redis://127.0.0.1:6379", collection="test_cache"
-        )
-    ),
+    cache=ingest_cache,
 )
 
 # Ingest directly into a vector db

llama-index-core/llama_index/core/storage/index_store/postgres_index_store.py

@@ -5,10 +5,10 @@
 
 
 class PostgresIndexStore(KVIndexStore):
-    """Mongo Index store.
+    """Postgres Index store.
 
     Args:
-        mongo_kvstore (MongoDBKVStore): MongoDB key-value store
+        postgres_kvstore (PostgresKVStore): Postgres key-value store
         namespace (str): namespace for the index store
 
     """
@@ -18,7 +18,7 @@ def __init__(
         postgres_kvstore: PostgresKVStore,
         namespace: Optional[str] = None,
     ) -> None:
-        """Init a MongoIndexStore."""
+        """Init a PostgresIndexStore."""
         super().__init__(postgres_kvstore, namespace=namespace)
 
     @classmethod