How To Force Search API To Reindex a Node / an Entity
By default Search API (Drupal 7) reindexes a node when the node gets updated. But what if you want to reindex a node / an entity on demand or via some other hook i.e. outside of update cycle? Turned out it is a quite simple exercise. You just need to execute this function call whenever you want to reindex a node / an entity:
See this snippet at dropbucket: http://dropbucket.org/node/1600 search_api_track_item_change marks the items with the specified IDs as "dirty", i.e., as needing to be reindexed. You need to supply this function with two arguments: entity_type ('node' in our example) and an array of entity_ids you want to be reindexed. Once you've done this, Search API will take care of the rest as if you've just updated your node / entity. Additional tip: In some cases, it's worth to clear field_cache for an entity before sending it to reindex:
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This is the case, when you manually save / update entity values via sql queries and then want to reindex the result (for example, radioactivity module doesn't save / update a node, it directly manipulates data is sql tables). That way you'll ensure that search_api reindexes fresh node / entity and not the cached one.