Default theme implementation to display a search block.
- plugin_id: The ID of the block implementation.
- label: The configured label of the block if visible.
- configuration: A list of the block's configuration values.
- label: The configured label for the block.
- label_display: The display settings for the label.
- module: The module that provided this block plugin.
- cache: The cache settings.
- Block plugin specific settings will also be stored here.
- block - The full block entity.
- label_hidden: The hidden block title value if the block was configured to hide the title ('label' is empty in this case).
- module: The module that generated the block.
- delta: An ID for the block, unique within each module.
- region: The block region embedding the current block.
- content: The content of this block.
- attributes: array of HTML attributes populated by modules, intended to
be added to the main container tag of this template.
- id: A valid HTML ID and guaranteed unique.
- title_attributes: Same as attributes, except applied to the main title tag that appears in the template.
- title_prefix: Additional output populated by modules, intended to be displayed in front of the main title tag that appears in the template.
- title_suffix: Additional output populated by modules, intended to be displayed after the main title tag that appears in the template.