[benchmarks] pin elasticsearch-py version to avoid TLS certs bug

elasticsearch-py 6.0.0 introduced a TLS cert verification bug:

  https://github.com/elastic/elasticsearch-py/issues/669

That bug affects our benchmarks ci pipeline:

  https://0xacab.org/leap/soledad/issues/8993#note_128667

This commit only pins the version of elasticsearch-py used by
benchamarks to avoid that bug. This pinning should probably be removed
when the next version of elasticsearch-py is released.

Closes #8993.

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 041f5de2..ca7c11f2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,7 +27,7 @@ deps =
 # used by benchmarks
     psutil
     pytest-benchmark
-    elasticsearch
+    elasticsearch==5.5.1
     certifi
 # used by e2e tests
     srp