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Target customers: users who need to resolve the following issues when they switch the log engine from Elasticsearch to Log Service: long API adaption cycles, large workloads of syntax rewriting, and high costs in report migration. Features released: Log Service is fully compatible with open source Elasticsearch syntax. Elasticsearch is an open source, distributed search and analytics engine based on Apache Lucene. Elasticsearch is commonly used for data processing and analysis. If you switch the log engine from Elasticsearch to Log Service, you may need to change your usage habits and upstream and downstream programs. To resolve these issues, Log Service provides the Elasticsearch-compatible API to ensure smooth migration of Elasticsearch query and analysis solutions and to reduce the difficulty in using Log Service.