diff --git a/drivers/csv.driver.js b/drivers/csv.driver.js
index b393d83..33c176a 100644
--- a/drivers/csv.driver.js
+++ b/drivers/csv.driver.js
@@ -10,6 +10,7 @@ class CSV extends Driver {
         this.id = 'csv';
         this.indexCounter = 0;
         this.propertyMap = {};
+        this.header = '';
     }
 
     getInfo(callback) {
@@ -119,10 +120,12 @@ class CSV extends Driver {
             }
 
         }
+        this.header = header;
         if (!env.options.target.noheader) {
             if (!fs.existsSync(env.options.target.file) || fs.statSync(env.options.target.file).size === 0) {
                 fs.writeFileSync(env.options.target.file, header + '\n', {encoding: 'utf8'});
             }
+            
         }
         callback();
     }
@@ -135,6 +138,16 @@ class CSV extends Driver {
         for (let doc of docs) {
             let line = [this.propertyMap.length];
             for (let property in doc._source) {
+                if (!this.propertyMap[property]) {
+                    this.propertyMap[property] = this.indexCounter++;
+                    let separator = env.options.target.separator;
+                    let newHeader = this.header +  separator + this._escape(env, property);
+                    let oldHeader = this.header + "";
+                    this.header = newHeader + '';
+                    var data = fs.readFileSync(env.options.target.file, 'utf8');
+                    var result = data.replace(oldHeader, newHeader);
+                    fs.writeFileSync(env.options.target.file, result, 'utf8')
+                }
                 line[this.propertyMap[property]] = this._escape(env, doc._source[property]);
             }
             line.unshift(doc._type);
diff --git a/drivers/elasticsearch.driver.js b/drivers/elasticsearch.driver.js
index a612338..08b7ae8 100644
--- a/drivers/elasticsearch.driver.js
+++ b/drivers/elasticsearch.driver.js
@@ -400,7 +400,7 @@ class Elasticsearch extends Driver {
     }
 
     _getQuery(env) {
-        let fields = [ '_source', '_timestamp', '_version', '_routing', '_percolate', '_parent', '_ttl' ];
+        let stored_fields = [ '_source', '_timestamp', '_version', '_routing', '_percolate', '_parent', '_ttl' ];
         let size = env.options.source.size;
         let query = env.options.source.query;
         if (env.options.source.index) {
@@ -408,17 +408,17 @@ class Elasticsearch extends Driver {
             let indexQuery = { indices: { indices, query, no_match_query: 'none' }};
             if (env.options.source.type) {
                 if (env.statistics.source.version.lt(2.0)) {
-                    return { fields, size, query: indexQuery, filter: { type: { value: env.options.source.type }} };
+                    return { stored_fields, size, query: indexQuery, filter: { type: { value: env.options.source.type }} };
                 }
-                let payload = { fields, size, query: { bool: { must: [ indexQuery], should: [], minimum_should_match: 1}}};
+                let payload = { stored_fields, size, query: { bool: { must: [ indexQuery], should: [], minimum_should_match: 1}}};
                 for (let type of env.options.source.type.split(',')) {
                     payload.query.bool.should.push({ type: { value: type }});
                 }
                 return payload;
             }
-            return { fields, size, query: indexQuery};
+            return { stored_fields, size, query: indexQuery};
         }
-        return { fields, size, query };
+        return { stored_fields, size, query };
     }
 
     /**
@@ -442,7 +442,7 @@ class Elasticsearch extends Driver {
                 callback(null, data.hits ? data.hits.hits : []);
             });
         } else {
-            request.source.post(env, '/_search?search_type=scan&scroll=60m', query, (err, data) => {
+            request.source.post(env, '/_search?scroll=60m', query, (err, data) => {
                 if (err) {
                     return callback(err);
                 }
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..d509bb8
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1517 @@
+{
+  "name": "elasticsearch-exporter",
+  "version": "2.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "align-text": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "requires": {
+        "kind-of": "3.2.2",
+        "longest": "1.0.1",
+        "repeat-string": "1.6.1"
+      }
+    },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
+    },
+    "argparse": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
+      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "1.0.3"
+      }
+    },
+    "asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
+    },
+    "asn1": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
+      "dev": true
+    },
+    "assert-plus": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
+      "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
+      "dev": true
+    },
+    "assertion-error": {
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+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
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+      "dev": true
+    },
+    "async": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
+      "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+      "requires": {
+        "lodash": "4.17.5"
+      }
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
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+      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8=",
+      "dev": true
+    },
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+      "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
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+    },
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "bcrypt-pbkdf": {
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+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
+      "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "tweetnacl": "0.14.5"
+      }
+    },
+    "bignumber.js": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-4.1.0.tgz",
+      "integrity": "sha512-eJzYkFYy9L4JzXsbymsFn3p54D+llV27oTQ+ziJG7WFRheJcNZilgVXMG0LoZtlQSKBsJdWtLFqOD0u+U0jZKA=="
+    },
+    "boom": {
+      "version": "2.10.1",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
+      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
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+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
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+        "concat-map": "0.0.1"
+      }
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+    "browser-stdout": {
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+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
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+      "integrity": "sha1-k8ENOeqltYQVy8QFLz5T5WKwtyw="
+    },
+    "buffer-shims": {
+      "version": "1.0.0",
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+      "integrity": "sha1-mXjOMXOIxkmth5MCjDR37wRKi1E="
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+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz",
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+        "escape-string-regexp": "1.0.5",
+        "has-ansi": "2.0.0",
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+    },
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+        "minimist": "1.2.0",
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+}
diff --git a/package.json b/package.json
index 8b3cd37..f70f6fc 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,8 @@
   "version": "2.0.1",
   "os": [
     "darwin",
-    "linux"
+    "linux",
+    "win32"
   ],
   "author": "Ravi Gairola <mallox@pyxzl.net>",
   "repository": {
@@ -72,7 +73,7 @@
     "bigquery"
   ],
   "dependencies": {
-    "async": "^2",
+    "async": "^2.6.0",
     "colors": "^1",
     "elasticsearch": "^12",
     "graceful-fs": "^4",