What are the rules for field names?
You must follow these rules when creating field names:
- Valid characters include uppercase and lowercase letters of the alphabet, numeric characters 0 through 9, and the period character.
- Field names must begin with a letter of the alphabet.
- Spaces and all other special characters are not allowed.
Table of Contents
How is an index named in Elasticsearch?
Amazon ES indexes have the following naming restrictions:
- All letters must be lowercase.
- Index names cannot start with _ or – .
- Index names cannot contain spaces, commas, : , ” , * , + , / , / , | , ? , # , > or < .
What are the rules for writing a field name in a database?
Rules for naming tables and fields
- The name can contain up to 31 characters.
- It must start with a letter of the alphabet.
- It can contain any combination of letters, numbers, spaces, and underscores.
Which of the following is allowed in table names?
The rules for naming database objects (such as database tables, columns, views, and procedures) are as follows: Names can only contain alphanumeric characters and must begin with an alphabetic character or an underscore (_ ). Database names must begin with an alphabetic character and cannot begin with an underscore.
Why are there naming restrictions in Elasticsearch?
Many of these naming restrictions were implemented when Elasticsearch used the index name as the directory name to store data on disk, so the names had to be conservative to work well with different file systems (that’s why there are restrictions to disallow .. such as name, etc.).
Is there a maximum number of nested mappings in Elasticsearch?
The maximum number of distinct nested mappings in an index defaults to 50 . Fields and mapping types do not need to be defined before use. Thanks to dynamic mapping, new field names will be added automatically, simply by indexing a document. New fields can be added to both the top level mapping type and the inner object and nested fields.
What is the default query string in Elasticsearch?
When multiple fields are provided, it is also possible to modify how the different field queries are combined within each textual part using the type parameter. The possible modes are described here and the default value is best_fields. The top-level parameters of query_string include: The actual query to parse. See Query String Syntax.
Can a string field be indexed in Elasticsearch?
For example, a string field could be indexed as a text field for full-text search and as a keyword field for sorting or adding. Alternatively, you can index a string field with the standard parser, the English parser, and the French parser.