ElasticSearch

ElasticSearch

1. Commands

   • HTTP
     • Get
       • Search a document using the Id
         • GET Type/Document/Id
       • Search a document using a parameter
         • GET Type/Document/_search?q=attribute:searchParameter
       • _mapping
         • Check data types
     • Post
       • Create or update document
         • POST /Type/Document/Id/_update
           • { "doc" : { "name" : "New Name" } }
     • Put
       • Insert a document with specific Id
         • PUT Type/Document/Id
       • CHANGE A WHOLE DOCUMENT
     • Delete
       • Delets a document using a specific Id
         • DELETE Type/Document/Id
     • Head
       • Returns just HTTP headers
       • Do not return documents
       • Used to check the document existence

2. Documentation

   • Optimistic Concurrency
     • https://www.elastic.co/guide/en/elasticsearch/guide/current/optimistic-concurrency-control.html
   • ES header returns
     • took
       • Query time in milliseconds
     • time_out
       • True/False if query exceded search time
     • _shards.total
       • Number of shards used in query
     • _shards.successful | .failed
       • Number of shards without(or with) fails during query
     • hits.total
       • Number of found documents
     • hits.max_score
       • 0 to 1 value to express the match of query search
     • hits.hits
       • The found documents
   • Request body search scroll
     • https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-body.html#request-body-search-scroll
   • Data Types
     • Core
       • Number
         • long
         • short
         • byte
         • double
         • float
       • Text
         • String
       • Date
     • Other data types
       • https://www.elastic.co/guide/en/elasticsearch/reference/current/date.html

3. SQL vs NoSQL

   • SQL
     • DataBase
     • Table
     • Schema
     • Row
     • Column
   • NoSQL
     • Index
       • Logical Namespace
         • Points to >= 1 shards
     • Type
     • Mapping
     • Document
     • Field

4. Plugins

   • kopfe
     • Graphic interface to send HTTP commands
   • kibana

5. Shards

   • Partitioning data horizontally
     • Primary shard
       • Where write operations first occur
     • Replica shard
       • If operation occurs how expected receives the write operation
   • The number of shards must be defined at the creation moment and cannot be changed after that

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