The source wrote (citation):

Changes in the dissemination of Private Consumption and Private Investment Index and Indicators

The Bank of Thailand has made some changes in the dissemination of economic indices and indicators for the purpose of increasing efficiency and reduce redundancy.

2. The following tables are discontinued due to redundancy with other tables on the BOT website or original sources (effective April 2018, onwards)

2.1 Table EC_EI_015_S2 : Private Consumption Indicators

[...]

In response, we have archived the series by marking the metadata as "discontinued". Figures vary, and are not seasonally adjusted (NSA). The series run from as early as January 1989 to February 2018.

The series reside in the historical catalog (Thailand » Consumer » Miscellaneous measures of private consumption » Discontinued) and include, for example:

• CSQELCBLGUM.ITHA = [DISCONTINUED] Private Consumption: Electricity consumption - Large-scale business (consume 2000 kw onwards), (Mil. kilowat-hour, NSA)
• CSITCUM.ITHA     = [DISCONTINUED] Retail sales of textile and clothing, (Index 2010=100, NSA)
• CSQNABUM.ITHA    = [DISCONTINUED] Sales of beverage - Soda and soft drinks, (Mil. litres, NSA)

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a"find in catalog" mode that accepts a mnemonic.