# Most efficient mapping for a chat search engine

**URL:** <https://discuss.elastic.co/t/most-efficient-mapping-for-a-chat-search-engine/281434>\
**Category:** Elasticsearch\
**Created:** [August 14, 2021, 10:36am UTC](https://discuss.elastic.co/t/most-efficient-mapping-for-a-chat-search-engine/281434 "2021-08-14T10:36:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Baygon](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/baygon/32/91792_2.png) [@Baygon](https://discuss.elastic.co/u/Baygon)\
**Post date:** [August 14, 2021, 10:36am UTC](https://discuss.elastic.co/t/most-efficient-mapping-for-a-chat-search-engine/281434/1 "2021-08-14T10:36:49Z")

</div>

Hi,

I'm building a new cluster to allow search on our internal chat system.  
Given the volume of data to index, and the budget for it, storage efficiency is a key here.

```auto
Message structure:
channel_id: integer
user_id: integer
message_id: GUID
message: text
timestamp: currently date object, can be transformed into unix timestamp 
features: JSON 
profile: JSON
reply_parent_message_id: GUID
role: JSON
score: integer between 0 and 100

```

The use cases will be searches based on timestamp, channel\_id, user\_id, full text search on the message field, filtering by feature, profile or role containing a specific keyword.  
The rest is only for display in search results.

In terms of aggregations I would need to make histograms of the count of messages per unit of time per channel\_id between 2 timestamps, and a average of the score field for all messages for one channel\_id between 2 timestamps.

So I'm thinking of building my index template mappings the following way:

```auto
{
  "mappings": {
    "properties": {
      "channel_id": {
        "type": "integer",
        "index": true
      },
      "user_id": {
        "type": "integer",
        "index": true
      },
      "message_id": {
        "type": "keyword",
        "norms": false,
        "index_options": "freqs"
      },
      "message": {
        "type": "text"
      },
      "timestamp": {
        "type": "date"
      },
      "features": {
        "type": "text"
      },
      "profile": {
        "type": "text"
      },
      "reply_parent_message_id": {
        "type": "keyword",
        "norms": false,
        "index_options": "freqs"
      },
      "role": {
        "type": "text"
      },
      "score": {
        "type": "byte",
        "index": false
      }
    }
  }
}

```

My main interrogations are about the GUIDs and the message itself.  
I understand that for GUIDs since I will only store it but not filter or search that's the best way to use minimal space.  
For the message I would only search for specific keywords and return the full message, so text is the best format.  
Could you please confirm if my assumptions are correct and my mapping ok?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 11, 2021, 10:37am UTC](https://discuss.elastic.co/t/most-efficient-mapping-for-a-chat-search-engine/281434/2 "2021-09-11T10:37:21Z")

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