From ed5a1cce8eddbcd6f18b8cafe95bfd9b33253528 Mon Sep 17 00:00:00 2001
From: Husain Zafar <husainzafar1996@gmail.com>
Date: Sun, 19 Feb 2017 16:04:32 +0530
Subject: [PATCH] This commit modifies the elasticsearch/connection_pool.py
 file to solve the list index out of range error. (#539)

Fixes #371
---
 elasticsearch/connection_pool.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/elasticsearch/connection_pool.py b/elasticsearch/connection_pool.py
index 3ec43edf..dbe9a787 100644
--- a/elasticsearch/connection_pool.py
+++ b/elasticsearch/connection_pool.py
@@ -1,6 +1,7 @@
 import time
 import random
 import logging
+import threading
 
 try:
     from Queue import PriorityQueue, Empty
@@ -58,12 +59,12 @@ class RoundRobinSelector(ConnectionSelector):
     """
     def __init__(self, opts):
         super(RoundRobinSelector, self).__init__(opts)
-        self.rr = -1
+        self.data = threading.local()
 
     def select(self, connections):
-        self.rr += 1
-        self.rr %= len(connections)
-        return connections[self.rr]
+        self.data.rr = getattr(self.data, 'rr', -1) + 1
+        self.data.rr %= len(connections)
+        return connections[self.data.rr]
 
 class ConnectionPool(object):
     """