make header exactly the size needed

Signed-off-by: Gil Raphaelli <[email protected]>

Author: graphaelli

plugins/out_es/es.c

@@ -890,7 +890,8 @@ static void cb_es_flush(struct flb_event_chunk *event_chunk,
         flb_http_basic_auth(c, ctx->cloud_user, ctx->cloud_passwd);
     }
     else if (ctx->http_api_key) {
-        header_line = flb_sds_create_size(48);
+        // 7 for ApiKey + space
+        header_line = flb_sds_create_size(strlen(ctx->http_api_key)+7);
         if (header_line == NULL) {
             flb_plg_error(ctx->ins, "failed to format API key auth header");
             goto retry;