Support timeout = 0 in search query (#2934)

* Support query timeout = 0

In RediSearch query timeout = 0 means unlimited timeout.
In the current implementation, the query timeout is only updated `if timeout` which in case of 0, translates to false.
Since the default timeout of the `query` class is None, replacing the condition with `if self._timeout is not None` will also work for 0.
If the parameter is not a positive integer, redis server will raise an exception.

related issue: #2928 #2839

* added a test to quety.timeout(0)

* raise an exception if query TIMEOUT is a non negative integer

* fixed the query test to catach AttributeError

* Moved validating timeout to timeout()

Raise the exception when the timeout is set instead of when the query is performed

* updates test to catch the exception when query.timeout() is called

* Update redis/commands/search/query.py

Co-authored-by: GuyAv46 <47632673+GuyAv46@users.noreply.github.com>

* Revert "Update redis/commands/search/query.py"

This reverts commit fb2b710.

* Revert "updates test to catch the exception when query.timeout() is called"

This reverts commit 6590130.

* Revert "Moved validating timeout to timeout()"

This reverts commit 7a020bd.

* Revert "fixed the query test to catach AttributeError"

This reverts commit 25d4ddf.

* Revert "raise an exception if query TIMEOUT is a non negative integer"

This reverts commit 3fb2c68.

---------

Co-authored-by: GuyAv46 <47632673+GuyAv46@users.noreply.github.com>

redis/commands/search/query.py

@@ -194,7 +194,7 @@ def _get_args_tags(self):
             args += self._ids
         if self._slop >= 0:
             args += ["SLOP", self._slop]
-        if self._timeout:
+        if self._timeout is not None:
             args += ["TIMEOUT", self._timeout]
         if self._in_order:
             args.append("INORDER")

tests/test_search.py

@@ -2264,6 +2264,8 @@ def test_withsuffixtrie(client: redis.Redis):
 def test_query_timeout(r: redis.Redis):
     q1 = Query("foo").timeout(5000)
     assert q1.get_args() == ["foo", "TIMEOUT", 5000, "LIMIT", 0, 10]
+    q1 = Query("foo").timeout(0)
+    assert q1.get_args() == ["foo", "TIMEOUT", 0, "LIMIT", 0, 10]
     q2 = Query("foo").timeout("not_a_number")
     with pytest.raises(redis.ResponseError):
         r.ft().search(q2)