elasticsearch[patch], community[patch]: update references, deprecate community classes (#18506)

Follow up on https://github.com/langchain-ai/langchain/pull/17467.

- Update all references to the Elasticsearch classes to use the partners
package.
- Deprecate community classes.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/community/langchain_community/vectorstores/elasticsearch.py

@@ -15,6 +15,7 @@ from typing import (
 )
 
 import numpy as np
+from langchain_core._api import deprecated
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
 from langchain_core.vectorstores import VectorStore
@@ -113,6 +114,9 @@ class BaseRetrievalStrategy(ABC):
         return True
 
 
+@deprecated(
+    "0.0.27", alternative="Use class in langchain-elasticsearch package", pending=True
+)
 class ApproxRetrievalStrategy(BaseRetrievalStrategy):
     """Approximate retrieval strategy using the `HNSW` algorithm."""
 
@@ -233,6 +237,9 @@ class ApproxRetrievalStrategy(BaseRetrievalStrategy):
         }
 
 
+@deprecated(
+    "0.0.27", alternative="Use class in langchain-elasticsearch package", pending=True
+)
 class ExactRetrievalStrategy(BaseRetrievalStrategy):
     """Exact retrieval strategy using the `script_score` query."""
 
@@ -300,6 +307,9 @@ class ExactRetrievalStrategy(BaseRetrievalStrategy):
         }
 
 
+@deprecated(
+    "0.0.27", alternative="Use class in langchain-elasticsearch package", pending=True
+)
 class SparseRetrievalStrategy(BaseRetrievalStrategy):
     """Sparse retrieval strategy using the `text_expansion` processor."""
 
@@ -381,6 +391,9 @@ class SparseRetrievalStrategy(BaseRetrievalStrategy):
         return False
 
 
+@deprecated(
+    "0.0.27", alternative="Use class in langchain-elasticsearch package", pending=True
+)
 class ElasticsearchStore(VectorStore):
     """`Elasticsearch` vector store.