title: Delete an element from an array of an array in MongoDb
body: <p>Below is the schema for an array contacts. The contacts array has a field hashtag which is another array. How do I delete an element openLove from the array Hashtags?</p>
  
  <pre><code>"contacts" : [
      {
          "addedDate" : ISODate("2015-12-02T09:06:09.891Z"),
          "personEmailId" : "tell.fadgfdg@gmail.com",
          "_id" : ObjectId("565eb481bf35eeb83d7f9f13"),
          "verified" : true,
          "favorite" : true,
          "linkedinUserName" : null,
          "facebookUserName" : null,
          "twitterUserName" : "IamlifePaul",
          "count" : 2,
          "relationshipStrength_updated" : 0,
          "contactRelation" : {
              "decisionmaker_influencer" : null,
              "prospect_customer" : "prospect"
          },
          "source" : "abc",
          "mobileNumber" : "3546789",
          "skypeId" : "123",
          "designation" : "test",
          "companyName" : "Something",
          "location" : "Hyderabad, Telangana, India",
          "personName" : "Naveen Paul",
          "personId" : "565022d7dbeaeb9e17fc7083",
          "hashtag" : [
  
              "latestTag",
              "anotherTag",
              "#hash",
              "openLove",
              "hellTwo",
              "working?",
              "hello",
              "lol",
              "zxc"
          ],
          "lastInteracted" : ISODate("2015-12-08T05:07:53.746Z")
      },
  {
          "addedDate" : ISODate("2015-12-02T09:06:09.891Z"),
          "personEmailId" : "naveenpaul.fadgfdg@gmail.com",
          "_id" : ObjectId("565eb481bf35eeb83d7f9f13"),
          "verified" : true,
          "favorite" : true,
          "linkedinUserName" : null,
          "facebookUserName" : null,
          "twitterUserName" : "IamlifePaul",
          "count" : 2,
          "relationshipStrength_updated" : 0,
          "contactRelation" : {
              "decisionmaker_influencer" : null,
              "prospect_customer" : "prospect"
          },
          "source" : "abc",
          "mobileNumber" : "3546789",
          "skypeId" : "123",
          "designation" : "test",
          "companyName" : "Something",
          "location" : "Hyderabad, Telangana, India",
          "personName" : "Naveen Paul",
          "personId" : "565022d7dbeaeb9e17fc7083",
          "hashtag" : [
  
              "latestTag",
              "anotherTag",
              "#hash",
              "openLove",
              "hellTwo",
              "working?",
              "hello",
              "lol",
              "zxc"
          ],
          "lastInteracted" : ISODate("2015-12-08T05:07:53.746Z")
      },
  {
          "addedDate" : ISODate("2015-12-02T09:06:09.891Z"),
          "personEmailId" : "naveenpaul.fadgfdg@gmail.com",
          "_id" : ObjectId("565eb481bf35eeb83d7f9f13"),
          "verified" : true,
          "favorite" : true,
          "linkedinUserName" : null,
          "facebookUserName" : null,
          "twitterUserName" : "IamlifePaul",
          "count" : 2,
          "relationshipStrength_updated" : 0,
          "contactRelation" : {
              "decisionmaker_influencer" : null,
              "prospect_customer" : "prospect"
          },
          "source" : "abc",
          "mobileNumber" : "3546789",
          "skypeId" : "123",
          "designation" : "test",
          "companyName" : "Something",
          "location" : "Hyderabad, Telangana, India",
          "personName" : "Naveen Paul",
          "personId" : "565022d7dbeaeb9e17fc7083",
          "hashtag" : [
  
              "polly",
              "tagger",
              "#hash",
              "working?",
              "hello",
              "lol",
              "zxc"
          ],
          "lastInteracted" : ISODate("2015-12-08T05:07:53.746Z")
      }
  </code></pre>
  
  <p>How do I delete an element from the array Hashtags?
  for example remove <em>openLove</em>?</p>