feat(create_index): exit with warnings if header size settings are no…

…t in effect

This avoids issues with Elasticsearch 5 headers and Node.js 8.14/10.14
as described in #339

package.json

@@ -36,7 +36,8 @@
     "elasticsearch": "^15.0.0",
     "joi": "^14.0.0",
     "lodash.merge": "^4.6.0",
-    "pelias-config": "^3.5.0"
+    "pelias-config": "^3.5.0",
+    "pelias-logger": "^1.3.0"
   },
   "devDependencies": {
     "difflet": "^1.0.1",

scripts/create_index.js

@@ -2,6 +2,7 @@ const child_process = require('child_process');
 const http = require('http');
 
 const config = require('pelias-config').generate();
+const logger = require('pelias-logger').get('schema');
 const es = require('elasticsearch');
 
 const cli = require('./cli');
@@ -17,6 +18,20 @@ try {
   process.exit(1);
 }
 
+if (http.maxHeaderSize === undefined) {
+  logger.warning('You are using a version of Node.js that does not support the --max-http-header-size option.' +
+    'You may experience issues when using Elasticsearch 5.' +
+    'See https://github.com/pelias/schema#compatibility for more details.');
+}
+
+if (http.maxHeaderSize < 16384) {
+  logger.error('Max header size is below 16384 bytes. ' +
+    'Be sure to use the provided wrapper script in \'./bin\' rather than calling this script directly.' +
+    'Otherwise, you may experience issues when using Elasticsearch 5.' +
+    'See https://github.com/pelias/schema#compatibility for more details.');
+  process.exit(1);
+}
+
 cli.header("create index");
 const indexName = config.schema.indexName;