Fix cache key size and log into docker

nginx.vh.default.template.conf

@@ -22,8 +22,8 @@ server {
 
     #charset koi8-r;
 
-    access_log /var/log/nginx/access.log my_log_format;
-    error_log /var/log/nginx/error.log;
+    access_log /dev/stdout my_log_format;
+    error_log /dev/stderr;
 
     location /_search {
         if ($http_x_consumer_username = '') {
@@ -69,6 +69,7 @@ server {
 
         # cache ------------------------------------------
         proxy_cache elasticsearch;
+        proxy_buffer_size 8192;
         proxy_cache_valid 200 302 1m;
         proxy_cache_valid 404 1m;
         proxy_cache_background_update on;