setup.py: Remove the e2e_search feature.

The e2e_search feature depends on tantivy. The tantivy package got a
release on pypi in the meantime but the API changed in incompatible
ways.

Remove support for it so someone doesn't shoot himself in the foot.

README.md

@@ -93,22 +93,6 @@ UseKeyring = False
 IgnoreVerification = True
 ```
 
-### Experimental E2E search support.
-
-Pantalaimon can handle the search endpoint of a Matrix server as well, providing
-search support for E2E encrypted rooms.
-
-For this to work [tantivy](https://github.com/tantivy-search/tantivy) is needed.
-Tantivy is a full text search engine written in rust.
-
-The python bindings for tantivy are needed for pantalaimon. The bindings are not
-yet merged upstream, instead they can be found
-[here](https://github.com/matrix-org/tantivy/tree/topcollector_order_by/python).
-
-Note that rust nightly (tested version was: 1.36.0-nightly (50a0defd5 2019-05-21))
-and [setuptools-rust](https://pypi.org/project/setuptools-rust/) are required
-before the tantivy python bindings can be installed.
-
 Usage
 =====
 

pantalaimon/index.py

@@ -19,7 +19,7 @@ class InvalidQueryError(Exception):
     pass
 
 
-if util.find_spec("tantivy"):
+if False:
     import asyncio
     import datetime
     import json

setup.py

@@ -32,9 +32,6 @@ setup(
         "matrix-nio[e2e] >= 0.4.1"
     ],
     extras_require={
-        "e2e_search":  [
-            "tantivy",
-        ],
         "ui": [
             "dbus-python",
             "PyGObject",