es: add utility for removing fields

Signed-off-by: Jakub Sokołowski <jakub@status.im>

elasticsearch/delete_field.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+import os
+import json
+from optparse import OptionParser
+from elasticsearch import Elasticsearch
+
+HELP_DESCRIPTION='This a utility for deleting fields from documents.'
+HELP_EXAMPLE='Example: ./delete_field.py -i 2018-10-01 --delete'
+
+def parse_opts():
+    parser = OptionParser(description=HELP_DESCRIPTION, epilog=HELP_EXAMPLE)
+    parser.add_option('-H', '--host', dest='es_host', default='localhost',
+                      help='ElasticSearch host.')
+    parser.add_option('-P', '--port', dest='es_port', default=9200,
+                      help='ElasticSearch port.')
+    parser.add_option('-i', '--index-pattern', default='logstash-*',
+                      help='Patter for matching indices.')
+    parser.add_option('-f', '--field', type='str',
+                      help='Name of field to remove from documents.')
+    parser.add_option('-d', '--delete', action='store_true',
+                      help='Delete field from matching documents.')
+    (opts, args) = parser.parse_args()
+    
+    if not opts.field:
+        parser.error('Field not specified!')
+    
+    return (opts, args)
+
+def main():
+    (opts, args) = parse_opts()
+
+    es = Elasticsearch(
+        [{ 'host': opts.es_host,
+           'port': opts.es_port }],
+        timeout=1200,
+        retry_on_timeout=True
+    )
+
+    print('Cluster: {}'.format(es.info().get('cluster_name')))
+    
+    indices = es.indices.get(index=opts.index_pattern).keys()
+    
+    body = {
+        'query':{'bool':{'must':{'exists':{'field':opts.field}}}}
+    }
+
+    for index in indices:
+      resp = es.count(index=index, body=body)
+      count = resp.get('count')
+      print('{:22} count: {:6}'.format(index, count))
+
+      if opts.delete and count > 0:
+        body['script'] = 'ctx._source.remove("peer_id")'
+        try:
+            rval = es.update_by_query(index=index, body=body)
+        except Exception as ex:
+            print(json.dumps(ex.info, indent=2))
+        print('{:22} Updated: {:10} Failed: {}'.format(index, rval['updated'], rval.get('failed', 0)))
+
+if __name__ == '__main__':
+    main()